Reveal oddly chopped fish (3)
I believe the answer is:
eel
'fish' is the definition.
(eel is a type of fish)
'reveal oddly chopped' is the wordplay.
'oddly chopped' indicates alternate letters (letters in odd-numbered positions removed).
The alternate letters of 'reveal' are 'EEL'.
(Other definitions for eel that I've seen before include "Teleost fish" , "Snake-like sea creature" , "Slippery creature" , "Slender fish" , "Unagi, in a sushi bar" .)