It may help to change banks (6)
I believe the answer is:
bridge
This could be a double definition.
'it may help' is the first definition.
The definition suggests a singular noun which matches the answer.
'change banks' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'to' is the link.
Can you help me to learn more?
(Other definitions for bridge that I've seen before include "Requirement for spectacles" , "Game of cards" , "Span of popular card game" , "Structure spanning a divide" , "Hard ridge on the nose" .)