Remedy includes suitable seizure (7)
I believe the answer is:
capture
'seizure' is the definition.
(I know that seizure can be written as capture)
'remedy includes suitable' is the wordplay.
'remedy' becomes 'cure' (synonyms).
'includes' is an insertion indicator.
'suitable' becomes 'apt' (I've seen this in another clue).
'cure' going around 'apt' is 'CAPTURE'.
(Other definitions for capture that I've seen before include "Take by force" , "Take on board" , "Take opponent's piece (chess)" , "Take (eg, chess piece)" , "Seize, catch" .)