Crossword Genius

Word of prayer to cities' unopened public toilets (9)

Ross

I believe the answer is:

amenities

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

'public toilets' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

'word of prayer to cities' unopened' is the wordplay.
'word of prayer' becomes 'amen' (last word in a prayer).
'unopened' means to remove the first letter (without opening letter).
'cities' with its initial letter removed is 'ities'.
'amen'+'ities'='AMENITIES'

Can you help me to learn more?

(Other definitions for amenities that I've seen before include "Equipment" , "useful services?" , "conveniences" , "Useful facilities" , "pleasing features" .)

I've seen this clue in the Sydney Morning Herald.
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