Uncovered shop enhanced somewhat (4)
I believe the answer is:
open
'uncovered' is the definition.
(I've seen this before)
'shop enhanced somewhat' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'OPEN' is hidden within 'shop enhanced'.
(Other definitions for open that I've seen before include "unsealed" , "Undo; ajar" , "Frank; unfold" , "Not shut up or hidden" , "Available for business, exposed" .)