Daring to vex worker (7)
I believe the answer is:
gallant
'daring' is the definition.
(I've seen this before)
'vex worker' is the wordplay.
'vex' becomes 'gall' (both can mean to irritate).
'worker' becomes 'ant' (worker is a type of ant).
'gall'+'ant'='GALLANT'
'to' is the link.
(Other definitions for gallant that I've seen before include "Dashing gentleman" , "lover" , "Daring" , "Dandy" , "Courageous - politely attentive to women" .)