Stout is left in sink (5)
I believe the answer is:
burly
'stout' is the definition.
(I've seen this in another clue)
'left in sink' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' is an insertion indicator.
'sink' becomes 'bury' (synonyms).
'l' placed within 'bury' is 'BURLY'.
'is' acts as a link.
(Other definitions for burly that I've seen before include "Strong and heavy in build" , "Muscular and heavily built" , "Sturdily built" , "Stocky" , "Big and sturdy" .)