Protection for the head (6)
I believe the answer is:
helmet
'protection for the head' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for helmet that I've seen before include "Protective covering for head of motor-cyclist" , "Tin hat" , "Protective head-covering for armour or motor cyclist" , "Protective hat" , "Armour for the head" .)