Egg production centre (4)
I believe the answer is:
move
I believe this is a triple definition!
'egg' is the first definition.
(I know that bombard is a is a more specific form of the action of egg)
'production' is the second definition.
(thesaurus)
'centre' is the third definition.
(I know that centre is a more specific form of the action move)
(Other definitions for move that I've seen before include "Relocate" , "Change (house)" , "change position on board" , "Shift" , "Manoeuvre; go" .)