Seize brood of chickens (6)
I believe the answer is:
clutch
I believe this clue is a double definition.
'seize' is the first definition.
(synonyms)
'brood of chickens' is the second definition.
(I've seen this before)
(Other definitions for clutch that I've seen before include "Grasp the brood of chickens" , "Result of laying" , "Grasp - eggs - car pedal" , "Hold tight to the eggs" , "Grasp - eggs laid in nest" .)