Supply daughter with entertainment (4)
I believe the answer is:
fund
'supply' is the definition.
(thesaurus)
'daughter with entertainment' is the wordplay.
'daughter' becomes 'd'.
'with' says to put letters next to each other.
'entertainment' becomes 'fun' (I've seen this before).
'd' put after 'fun' is 'FUND'.
(Other definitions for fund that I've seen before include "Monetary resources" , "Capitalize" , "Pay for; kitty" , "Reserve of money set aside for a purpose" , "Pool - float" .)