Sheffield United had to overcome a poor first half to earn a share of the spoils with promotion hopefuls Leyton Orient at Bramall Lane.
Dean Cox put Orient into the lead after side-footing past Mark Howard from six yards.
Jamie Murphy equalised for the Blades after good work from Ben Davies and Conor Coady and John Brayford could have snatched all three points.
The draw means United are eight points off the play-offs with just six games remaining.
Clough said: “The performance in the first-half was frustrating to say the least, in the second-half we played with more urgency and you can see the difference in the game.
“We were slow and laboured in the first-half and the best we could have hoped for was getting in at 0-0, but from our point of view we have conceded a sloppy goal.
“We changed the focus a bit when we put Jamie Murphy down the middle and it was good ball by Ben Davies that created the goal.
“It was a great finish too, it can be difficult when you are clean through with so much time, but Jamie looked assured and in complete control.”