Robinson, given a rare start, capped a five-star show by hammering home his side's second goal on 68 minutes to set the seal on an excellent victory, after Jordan Rhodes had put the visitors ahead in the first half.
The win lifted Huddersfield to within two points of the play-off places and ended a run of three successive defeats.
Clark said: "You're always delighted when both your strikers get on the score sheet. I am delighted for Theo, his goals-to-start ratio must be fantastic."
Launch the Yorkshire Post's Coca-Cola Football League video player
Robinson, in for the injured Lee Novak, has netted seven league goals and Clark said: "For someone who has not started for so long, to show that energy and enthusiasm was fantastic."
Now the Huddersfield boss wants the 21-year-old striker to reproduce that form more often as the promotion race reaches its climax: "He has an unbelievable asset with his lightening pace, he just needs to show that all the time," said Clark.
The Huddersfield boss was also pleased with Rhodes: "I'm delighted for Jordan as well. He has taken a hell of a battering over the past few weeks," he said. "It's no secret I was trying to bring in a striker because I was down to just two lads and to maybe give Jordan a rest, but he looked very sharp, so maybe I was wrong."
Leyton Orient: Morris; Cave-Brown, Chorley, Mkandawire, Daniels; Doran (Baker 70), Thornton, Chambers, Demetriou (Jarvis 70); McGleish, Tehoue (Scowcroft 80). Unused substitutes: Jones, Ashworth, Smith, Mike.
Huddersfield Town: Smithies; Peltier, P Clarke, Trotman, Heffernan; Pilkington, Drinkwater, Collins, Roberts (Berrett 86); Rhodes (Kay 74), Robinson. Unused substitutes: N. Clarke, T. Clarke, Williams, Eastwood, Pearce.
Referee: S Tanner (Somerset).
Man of the match: Theo Robinson.
This season the Yorkshire Post has an exciting new match-day service, called Match Centre. Here you will find minute-by-minute updates, stats and team formations. Plus reports from every game in England, from the Premier League down to the Blue Square Premier.
Simply select your game from the pull down menu, then click on the 'i' information button on the right of the fixture and it will give you access to everything you need to know about your team.
So if you can't make it to a game, head for the Match Centre and we will give you the best seat in the house. Click the link below.
For the latest team news, score and commentary from your team check out our new Match Centre