Crossword Genius

Anybody going by with a boy (6)

Ross

I believe the answer is:

person

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'anybody going' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'with a boy' is the wordplay.
'with' is a charade indicator (letters next to each other).
'a' becomes 'per' (eg 'one a day' means 'one per day').
'boy' becomes 'son' (synonyms).
'per'+'son' is 'PERSON'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for person that I've seen before include "Individual human being" , "Type" , "A man or woman" , "present appearing in this" , "Bod" .)

I've seen this clue in the Evening Standard.
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