Crossword Genius

Frock for church (6)

Ross

I believe the answer is:

ordain

I'm a little stuck... Click here to teach me more about this clue!

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" .)

I've seen this clue in The Telegraph.
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