Crossword Genius

Most important person, as anaesthetist, single (6,3)

Ross

I believe the answer is:

number one

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

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

'person as anaesthetist single' is the wordplay.
I cannot quite see how this works, but
'person' could be 'one' (I've seen this in other clues) 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 understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for number one that I've seen before include "Cut" , "arch" , "Top-of-the-charts hit" , "Wee" , "top man?" .)

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app