Knocking back containers of Scotch? (4)
I believe the answer is:
stop
'scotch?' is the definition.
(thesaurus)
'knocking back containers' is the wordplay.
'knocking back' says the letters should be written backwards.
'containers' becomes 'pots' (pot is a kind of container).
'pots' in reverse letter order is 'STOP'.
'of' is the link.
(Other definitions for stop that I've seen before include "Withhold payment" , "Arrest" , "colon, say" , "Come to a halt" , "Halt; finish" .)