Newspaper angle for swimmer (7)
I believe the answer is:
sunfish
'swimmer' is the definition.
(sunfish is a kind of aquatic vertebrate)
'newspaper angle' is the wordplay.
'newspaper' becomes 'sun' (UK newspaper The Sun).
'angle' becomes 'fish' (synonyms).
'sun'+'fish'='SUNFISH'
'for' acts as a link.
(Other definitions for sunfish that I've seen before include "one comes round in ocean" , "Ocean swimmer" .)