The 25-year old Scotland international had a sell-on agreement written into his contract when he left Ibrox in 2009 and ‘Gers number two Ian Durrant hopes the club allows the coaching staff to use it on adding some quality to the playing roster.
"I don't know what the club negotiated when Charlie left but if we get money then hopefully it'll come in handy. Hopefully we can use it to unearth some other players,” he said.
As for the move, Durrant said it was something that Adam had certainly earned.
"He got a fair bit of stick at the club but he's worked hard and got his rewards,” he added.
"I think the stick was a bit harsh on him at times. But this shows if you work hard you get your rewards, it's as simple as that.”