Provides money for husband-to-be to clothe new son (8)
I believe the answer is:
finances
'provides money for' is the definition.
(I've seen this before)
'husband-to-be to clothe new son' is the wordplay.
'husband-to-be' becomes 'fiance'.
'to clothe' is an insertion indicator.
'new' becomes 'n'.
'son' becomes 's'.
'fiance' going around 'n' is 'finance'.
'finance'+'s'='FINANCES'
(Other definitions for finances that I've seen before include "funds" , "Provides the capital" , "Furnishes with money" , "Provides money for" , "Monetary resources" .)