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' put inside 'bury' is 'BURLY'.
'is' is the 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" .)