I rowed recklessly being an odd fish (6)
I believe the answer is:
weirdo
'an odd fish' is the definition.
(I've seen this before)
'i rowed recklessly' is the wordplay.
'recklessly' is an anagram indicator.
'i'+'rowed'='irowed'
'irowed' anagrammed gives 'WEIRDO'.
'being' acts as a link.
(Other definitions for weirdo that I've seen before include "Unpleasantly strange or eccentric person" , "Eccentric type" , "Crank - oddball" , "Fruitcake" , "queer fish" .)