Singer pinches right cheek (5)
I believe the answer is:
brass
'cheek' is the definition.
('brass' can be a synonym of 'cheek')
'singer pinches right' is the wordplay.
'singer' becomes 'bass' (I've seen this before**).
'pinches' is an insertion indicator (pinch can mean to steal).
'right' becomes 'r' (common abbreviation).
'bass' placed around 'r' is 'BRASS'.
(Other definitions for brass that I've seen before include "Metal alloy" , "Ready" , "section of orchestra" , "Metal - cheek" , "Gall" .)