Places to swim found returning to vessel (5)
I believe the answer is:
sloop
'vessel' is the definition.
(thesaurus)
'places to swim found returning' is the wordplay.
'places to swim' becomes 'pools'.
'found returning' says the letters should be written in reverse.
'pools' backwards is 'SLOOP'.
'to' acts as a link.
(Other definitions for sloop that I've seen before include "One-masted sailing ship" , "Type of sailing boat" , "Vessel with a single mast" , "'----- John B', 1966 Beach Boys' hit" , "one going to sea" .)