Crossword Genius

The name the number goes by (4,5)

Ross

I believe the answer is:

song title

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'the name' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'number goes by' is the wordplay.
'number' becomes 'song' (as in a musical number).
'goes by' becomes 'title' (I can't explain this - if you can you should give a lot more credence to this answer).
'song'+'title'='SONG TITLE'

'the' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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