"For 44 minutes I really enjoyed the game; I thought we were the better team. I thought we were on top of the game and the crowd was edgy," Clayton told the club's official website.
"The second half was the worst 45 minutes we've played this season; it's unfortunate it's come here. When you come to Elland Road, you have to keep the first and last five minutes of each half tight, because if you don't the crowd play a massive part."
The defeat leaves Huddersfield 14th in the Championship.