Crossword Genius

A church provides one (3)

Ross

I believe the answer is:

ace

'one' is the definition.
('ace' can be a synonym of 'one')

'a church' is the wordplay.
'church' becomes 'ce' (abbreviation for Church of England**).
'a'+'ce'='ACE'

'provides' acts as a link.

(Other definitions for ace that I've seen before include "Great" , "Best type of tennis serve" , "Single unit on playing cards" , "Unreturnable serve" , "Excellent" .)

I've seen this clue in The Times.
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