Cooking vessel in sink (3)
I believe the answer is:
pot
I believe this clue is a double definition.
'cooking vessel' is the first definition.
(I've seen this before)
'sink' is the second definition.
(I've seen this before)
'in' acts as a link.
(Other definitions for pot that I've seen before include "Somewhere to go" , "Preserve; drug" , "Jar, cannabis" , "Street name for marijuana" , "Cooking vessel, plant container and street drug" .)