Crossword Genius

Boy with good musical number (4)

Ross

I believe the answer is:

song

'musical number' is the definition.
(I've seen this in another clue)

'boy with good' is the wordplay.
'boy' becomes 'son' (synonyms).
'with' means one lot of letters go next to another.
'good' becomes 'g' (abbreviation).
'son'+'g'='SONG'

(Other definitions for song that I've seen before include "Musical composition; air" , "Piece of vocal music" , "Tune" , "Ballad, aria" , "Musical rendition" .)

I've seen this clue in The Guardian.
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