See second container? (4)
I believe the answer is:
spot
'see' is the definition.
(thesaurus)
'second container?' is the wordplay.
'second' becomes 's' (common abbreviation).
'container?' becomes 'pot' (pot is a kind of container**).
's'+'pot'='SPOT'
(Other definitions for spot that I've seen before include "awkward situation" , "small amount" , "Place - zit" , "Mark, dot" , "Notice; pimple" .)