Bar is to accumulate funds (4)
I believe the answer is:
save
This clue could be a double definition.
'bar' is the first definition.
(both can mean 'except')
'accumulate funds' is the second definition.
'save' can be an answer for 'accumulate' (I've seen this in another clue). I'm not sure about the 'funds' bit.
'is to' is the link.
Can you help me to learn more?
(Other definitions for save that I've seen before include "Keep" , "Rescue for a rainy day?" , "Bar" , "Rescue from danger" , "Except; hoard" .)