Crossword Genius

Commander of less sensitive unit (6,3)

Ross

I believe the answer is:

number one

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

'commander of less sensitive unit' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'less sensitive unit' is the wordplay.
'less sensitive' becomes 'number' (numb means insensitive or unfeeling).
'unit' becomes 'one' (synonyms).
'number'+'one'='NUMBER ONE'

Can you help me to learn more?

(Other definitions for number one that I've seen before include "arch" , "Yours truly" , "officer on board?" , "it concerns egoists" , "the most important person" .)

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