Seize some big rabbits (4)
I believe the answer is:
grab
'seize' is the definition.
(grabbing is a kind of seizing)
'some big rabbits' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'GRAB' is hidden in the letters of 'big rabbits'.
(Other definitions for grab that I've seen before include "Seize rudely" , "Catch hold (of)" , "'Seize, snatch (4)'" , "Grasp roughly" , "Impress" .)