Hates. Bash or shake? (6)
I believe the answer is:
abhors
'hates' is the definition.
(abhorring is a kind of hating)
'bash or shake?' is the wordplay.
'shake?' indicates an anagram (I've seen 'shook' mean this).
'bash'+'or'='bashor'
'bashor' with letters rearranged gives 'ABHORS'.
(Other definitions for abhors that I've seen before include "Hates very much" , "Finds repugnant" , "Dislikes very much" , "protests against being old" , "Loathes, abominates" .)