Crossword Genius

Many, perhaps, seem relatively insensitive (6)

Ross

I believe the answer is:

number

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

'many' is the definition.
(thesaurus)

'seem relatively insensitive' is the wordplay.
I cannot really understand how this works, but
'insensitive' could be 'numb' (synonyms) and 'numb' is located in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'perhaps' is the link.

Can you help me to learn more?

(Other definitions for number that I've seen before include "(Symbol for) quantity" , "Mathematical unit" , "Mathematical value" , "One possibly" , "For example, one" .)

I've seen this clue in the Evening Standard.
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