Bomb that might be dropped by Harrier? (3)
I believe the answer is:
egg
'bomb' is the definition.
(informal term for a bomb)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for egg that I've seen before include "Item with a yolk" , "Good, boiled, yoke or head" , "explosive" , "Breakfast food, perhaps" , "Reproductive part" .)