Pool bringing pleasure to many (4)
I believe the answer is:
fund
'pool' is the definition.
(thesaurus)
'pleasure to many' is the wordplay.
'pleasure' becomes 'fun' (I've seen this before).
'to many' becomes 'd'.
'fun'+'d'='FUND'
'bringing' is the link.
(Other definitions for fund that I've seen before include "Reserve of money for future use" , "Pay for; kitty" , "Stock, resources" , "Supply cash" , "Large stock; pay for" .)