Crossword Genius

Another's customs (5)

Ross

I believe the answer is:

mores

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

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

'another's' is the wordplay.
I cannot really see how this works, but
'another's' could be 'res' (I've seen this in other clues) and 'res' is located in the answer.
The remaining letters 'mo' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for mores that I've seen before include "Conventions, manners" , "Customs, manners" , "O tempora, O - !" , "Customs and conventions of society" , "Social customs of a group" .)

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