The midfielder has agreed a loan deal from Barclays Premier League giants West Ham and will spend the rest of the season in Scotland's top flight as he looks to guide Alan Archibald's side to safety.
After making his Jags debut in the Under-20 defeat to Celtic last week, Moncur made his second appearance last night as he netted along with Lee Gallacher for Scott McKenzie's side - which contained Archibald - as they drew 2-2 with St Johnstone at Firhill.
He could get a taste of first-team football when Thistle head to Fir Park this weekend to face high-flying Motherwell as Archie's side look for a boost in their battle to beat the drop.
And the 20-year-old is determined to turn on the style and show what he can do as he targets a place at the heart of the Firhill team's midfield.
Moncur said: "I am really enjoying it so far, all the lads are great and I have settled in well.
"I have been playing Under-21 football so far this season so I was looking to go out on loan and this was the one that felt right for me.
"I didn't know much about Thistle before I signed, but I heard they played good football and that is the style of player I am.
"I like to get the ball down and play and that is what the manager wants to do. Hopefully I can get into the team on Saturday and show the gaffer and fans what I can do.
"I played a lot at the start of the season, but in October I got an ankle injury which kept me out for a while.
"I am not long back so I only played a couple of games before coming up here.
"I am getting my fitness back, though, and the more games I play the better I will get."