Seize pedal (6)
I believe the answer is:
clutch
I believe this clue is a double definition.
'seize' is the first definition.
('clutch' can be a synonym of 'seize')
'pedal' is the second definition.
(clutch is a kind of pedal)
(Other definitions for clutch that I've seen before include "Hang on to" , "Quantity of eggs: cling to" , "Brood of chicks" , "Grasp, hold firmly" , "Grasp - eggs - car pedal" .)