Seize antidote suitable to be consumed (7)
I believe the answer is:
capture
'seize' is the definition.
(I know that capture is a kind of seize)
'antidote suitable to be consumed' is the wordplay.
'antidote' becomes 'cure' (I've seen this in other clues).
'suitable' becomes 'apt' (apt means appropriate or fitting).
'to be consumed' indicates putting letters inside.
'cure' enclosing 'apt' is 'CAPTURE'.
(Other definitions for capture that I've seen before include "Apprehend" , "Take (eg, chess piece)" , "Take by force" , "Seize, catch" , "Take opponent's piece (chess)" .)