Bit of a square peg, this salesman? (3)
I believe the answer is:
rep
'salesman?' is the definition.
(I've seen this before)
'bit of a square peg this' is the wordplay.
'bit of' indicates a hidden word.
'REP' is hidden in the letters of 'square peg this'.
(Other definitions for rep that I've seen before include "Salesperson" , "Sort of theatre" , "Repertory theatre" , "Corded fabric" , "Representative; fabric" .)