The Wolves midfielder, who has just completed a loan spell at Chesterfield has joined Gary Megson's side for a nominal fee and has signed a two-and-a-half-year contract at The City Ground.
"I was in the last year of my contract with Wolves and wanted to establish what their plans for me were" Clingan said.
"I may have left a Championship club but i don't regard this as a step down. Its a massive career move for me."