Crossword Genius

A peculiar code of rugby to many (3)

Ross

I believe the answer is:

rum

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

'a peculiar' is the definition.
(I know that peculiar can be written as rum)

'code of rugby to many' is the wordplay.
I cannot quite understand how this works, but
'rugby' could be 'ru' and 'ru' is found within the answer.
'many' could be 'm' (Roman numeral for a thousand) and 'm' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for rum that I've seen before include "Odd sort of drink" , "Strange; spirit" , "Unusual" , "Alcoholic drink from molasses" , "An alcoholic spirit - sounds odd" .)

I've seen this clue in the Evening Standard.
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