Clarke's issue is that he was purchased by a club who employ a system that was never going to suit him. Now you can rightfully say that's where his agent should be stepping him and advising, maybe he did for all we know, but it was a silly move.
A lot of their attacking build up is via Leif Davis wide down the left, which in turn forces Clarke inside and narrow, thus limiting most of what he is best at.
They've used Szmodics on the left quite often too and when Szmodics has played it there it's ended up being pretty similar production from him and Clarke (2 goals out wide for Sammy, 2 assists for Clarke), two players who were arguably best in class in last season's Championship.
Szmodics for example had 27 goals last season and aside from 1 game out wide, played every other one centrally. Yet McKenna is playing him on the left almost exclusively.
To me it's more of an issue of Ipswich signing players for the sake of it, with no real thoughts on how they are going to fit, but then again the player/his advisors have to take some accountability and responsibility too.