Put swimmer on the phone? (5)
I believe the answer is:
place
'put' is the definition.
(synonyms)
'swimmer on the phone?' is the wordplay.
'swimmer' becomes 'plaice' (plaice is a kind of fish).
'on the phone?' shows a homophone (sound like) (I've seen 'on the phone' mean this).
'plaice' sounds like 'PLACE'.
(Other definitions for place that I've seen before include "Locus" , "Put in - winning position" , "Location; put" , "Endearingly pretty" , "vacancy" .)