Spend less cash in bar (4)
I believe the answer is:
save
This clue might be a double definition.
'spend less' is the first definition.
(synonyms)
'cash in bar' is the second definition.
'save' can be an answer for 'bar' (both can mean 'except'). I am not sure about the 'cash in' bit.
Can you help me to learn more?
(Other definitions for save that I've seen before include "Rescue for a rainy day?" , "Preserve; except" , "Keep" , "Retain" , "Salvage" .)