Crossword Genius

Two companions outside historic city chapel? (6)

Ross

I believe the answer is:

church

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

'chapel?' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

'two companions outside historic city' is the wordplay.
'two companions' can mean two substitutions for 'companion'.
'companion' becomes 'ch' (Companion of Honour).
'companion' becomes 'ch' (Companion of Honour).
'outside' means one lot of letters goes inside another.
'historic city' becomes 'ur' (ancient Sumerian city state).
'ch'+'ch'='chch'
'chch' going around 'ur' is 'CHURCH'.

Can you help me to learn more?

(Other definitions for church that I've seen before include "fold" , "Body professing common creed" , "See 1" , "See 11" , "Building for religious worship" .)

I've seen this clue in The Guardian.
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