Depositing anti-monarchist slogan? (7)
I believe the answer is:
banking
'depositing' is the definition.
('bank' can be a synonym of 'deposit')
I cannot understand how the remainder of the clue works.
(Other definitions for banking that I've seen before include "Engaging in the business of depositing and lending money" , "Depositing and withdrawing money" , "(Of aircraft) turning" , "Relying" , "financial activity" .)