Damage a submarine centre (3)
I believe the answer is:
mar
'damage' is the definition.
(to mar is to spoil or damage)
'a submarine centre' is the wordplay.
'centre' says the answer is hidden in the clue (hidden in the middle of the letters).
'MAR' is hidden within 'submarine'.
(Other definitions for mar that I've seen before include "when spring growth starts?" , "hurt" , "Disfigure" , "Make imperfect" , "Spoil, damage" .)