I turn rowboat around for fish (7,5)
I believe the answer is:
rainbow trout
'fish' is the definition.
(I've seen this before)
'i turn rowboat around' is the wordplay.
'around' indicates an anagram.
'i'+'turn'+'rowboat'='iturnrowboat'
'iturnrowboat' with letters rearranged gives 'RAINBOW-TROUT'.
'for' acts as a link.
(Other definitions for rainbow trout that I've seen before include "Finely coloured fish" , "Popular food fish" , "game swimmer" .)