Crossword Genius

A church service (3)

Ross

I believe the answer is:

ace

'service' is the definition.
(I've seen this before)

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

(Other definitions for ace that I've seen before include "The opponent can't return this serve" , "Adept" , "Very good; playing card" , "Expert; one" , "Player who excels" .)

I've seen this clue in the Independent, The Guardian, The Times and The Telegraph.
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