Crossword Genius

Having a best-selling record myself (6,3)

Ross

I believe the answer is:

number one

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

'myself' is the definition.
(I've seen this before)

'having a best-selling record' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'one' and 'one' is present in the answer.
The remaining letters 'number' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for number one that I've seen before include "Top-of-the-charts hit" , "top-selling record" , "top man?" , "Yours truly" , "leader" .)

Want a hint initially instead of a full solution? Install my app