Equable English archdeacon (4)
I believe the answer is:
even
'equable' is the definition.
(I've seen this in another clue)
'english archdeacon' is the wordplay.
'english' becomes 'e' (abbreviation).
'archdeacon' becomes 'ven' (abbreviation for The Venerable).
'e'+'ven'='EVEN'
(Other definitions for even that I've seen before include "Smooth, uniform in quality" , "Late in the day" , "Peaceful" , "exact" , "Level, equal" .)