Seize egg collection (6)
I believe the answer is:
clutch
This clue might be a double definition.
'seize' is the first definition.
(synonyms)
'egg collection' is the second definition.
'clutch' can be an answer for 'collection' (clutch is a kind of collection). I am not certain of the 'egg' bit.
Can you help me to learn more?
(Other definitions for clutch that I've seen before include "Number of birds hatched at the same time" , "Grip tightly for car engine part" , "Grab - set of eggs" , "Depressing feature of car" , "Grasp - gear changing device" .)