Shop usually has work (4)
I believe the answer is:
opus
'work' is the definition.
(I've seen this before)
'shop usually has' is the wordplay.
'has' indicates the answer is hidden within the clue.
'OPUS' is hidden within 'shop usually'.
(Other definitions for opus that I've seen before include "Showing creative skill" , "Work of 25 perhaps" , "Work (of a composer?)" , "Composer's catalogue number" , "Work or composition, usually musical" .)