Frock for church (6)
I believe the answer is:
ordain
This clue could be a double definition.
'frock' is the first definition.
(I've seen this before)
'church' is the second definition.
Although both the answer and definition are verbs in their base form, I can't see how they can define each other.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for ordain that I've seen before include "Rule" , "Establish" , "Inroad (anag.)" , "Invest with priestly authority" , "Make a decree" .)