Batman chopped a little chicken (6)
I believe the answer is:
bantam
'a little chicken' is the definition.
(I've seen this in another clue)
'batman chopped' is the wordplay.
'chopped' indicates an anagram (letters chopped or smashed up).
'batman' anagrammed gives 'BANTAM'.
(Other definitions for bantam that I've seen before include "Nab mat (anag)" , "weight of a pug" , "small quarrelsome person" , "Very small - batman (anag)" , "poultry" .)