Get even with archdeacon in maturity (6)
I believe the answer is:
avenge
'get even' is the definition.
(I've seen this before)
'archdeacon in maturity' is the wordplay.
'archdeacon' becomes 'ven' (abbreviation for The Venerable).
'in' indicates putting letters inside.
'maturity' becomes 'age' (I've seen this before).
'ven' placed into 'age' is 'AVENGE'.
'with' is the link.
(Other definitions for avenge that I've seen before include "Take satisfaction for injury received" , "Exact retribution, take satisfaction for injury" , "eg Nave (anag.)" , "Get one's own back for" , "Pay back for" .)