Good numbers coming up — one of those? (4)

I believe the answer is:

song

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'one of those?' is the definition.
I can't tell whether this defines the answer.

'good numbers coming up' is the wordplay.
'good' becomes 'g' (abbreviation).
'numbers' becomes 'nos' ('no' is an abbreviation for number).
'coming up' shows that the letters should be reversed in order (in a down clue, letters go up).
'g'+'nos'='gnos'
'gnos' written backwards gives 'SONG'.

Can you help me to learn more?

(Other definitions for song that I've seen before include "Unnecessary fuss" , "Piece of vocal music" , "Something recorded by 26 [FACES] , for example" , "Vocal composition" , "Ditty" .)

I've seen this clue in The Times.

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