Harry deprived of king's insignia (5)
I believe the answer is:
badge
'insignia' is the definition.
(I've seen this before)
'harry deprived of king's' is the wordplay.
'harry' becomes 'badger' (both can mean to bother or harass).
'deprived of' is a deletion indicator.
'king' becomes 'R' (abbreviation of Latin rex).
'badger' with 'r' taken away is 'BADGE'.
(Other definitions for badge that I've seen before include "Distinguishing mark" , "Identifying emblem" , "Worn emblem" , "Worn sign of membership or support" , "Emblem of belonging" .)