Refuse to eat hard batter (6)
I believe the answer is:
thrash
'batter' is the definition.
(thesaurus)
'refuse to eat hard' is the wordplay.
'refuse' becomes 'trash' (I've seen this before).
'to eat' indicates putting letters inside.
'hard' becomes 'h'.
'trash' placed around 'h' is 'THRASH'.
(Other definitions for thrash that I've seen before include "stuff" , "Trounce, beat soundly" , "tan" , "Noisy, lavish party" , "Punish" .)