Somewhat talentless, a shocking band (4)
I believe the answer is:
sash
'band' is the definition.
(sash is a kind of band)
'somewhat talentless a shocking' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'SASH' is hidden within 'talentless a shocking'.
(Other definitions for sash that I've seen before include "Decorative band" , "Window frame; cloth strip (worn over shoulder)" , "Popular band in Northern Ireland" , "Band worn over shoulder or round waist" , "Decoration for the twelfth" .)