Give to monarch breaking weapon (9)
I believe the answer is:
tolerance
'give' is the definition.
(I've seen this before)
'to monarch breaking weapon' is the wordplay.
'monarch' becomes 'er' (abbreviation for Elizabeth Regina, British Queen).
'breaking' means one lot of letters goes inside another.
'weapon' becomes 'lance' (lance is a kind of weapon).
'er' put inside 'lance' is 'lerance'.
'to'+'lerance'='TOLERANCE'
(Other definitions for tolerance that I've seen before include "Give" , "Broad-minded attitude" , "Willingness to accept the beliefs of others" , "Indulgence" , "Ability to be fair" .)