Check large sum of money on the counter (4)
I believe the answer is:
stop
'check' is the definition.
(synonyms)
'large sum of money on the counter' is the wordplay.
'large sum of money' becomes 'pots' (as in the phrase 'pots of money').
'on the counter' shows that the letters should be reversed in order (counter can mean in the opposite direction).
'pots' written backwards gives 'STOP'.
(Other definitions for stop that I've seen before include "period in US" , "Put off for ever" , "End - period" , "Standstill" , "Check" .)