Archdeacon on ecstasy helping with worship (10)
I believe the answer is:
veneration
'worship' is the definition.
(I've seen this before)
'archdeacon on ecstasy helping' is the wordplay.
'archdeacon' becomes 'ven'.
'on' means one lot of letters go next to another.
'ecstasy' becomes 'e' (informal term for the drug).
'helping' becomes 'ration' (I've seen this before).
'ven'+'e'+'ration'='VENERATION'
'with' acts as a link.
(Other definitions for veneration that I've seen before include "worship" , "Great respect" .)