Look in small container (4)
I believe the answer is:
scan
'look' is the definition.
(I've seen this before)
'small container' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'container' becomes 'can' (can is a kind of container).
's'+'can'='SCAN'
'in' is the link.
(Other definitions for scan that I've seen before include "Conform to rules of poetic metre" , "convert metres into feet?" , "Look over (in order to copy?)" , "Run over" , "Survey - examine" .)