Was inquisitive about the numbers on keys (5)

I believe the answer is:

nosed

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'was inquisitive' is the definition.
(I've seen this in another clue)

'the numbers on keys' is the wordplay.
'the numbers' becomes 'nos' ('no' is an abbreviation for number).
'on keys' becomes 'ed' (I can't justify this - if you can you should give a lot more credence to this answer).
'nos'+'ed'='NOSED'

'about' acts as a link.

Can you help me to learn more?

(Other definitions for nosed that I've seen before include "Scented" , "Checked wine's aroma" , "edged out" , "Started judging wine, say" , "Eased" .)

I've seen this clue in the Evening Standard.

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