Maybe, one anaesthetic? (6)

I believe the answer is:

number

I believe this clue is a double definition.

'maybe one' is the first definition.
(one is a number)

'anaesthetic?' is the second definition.
(i.e. something that makes things numb)

(Other definitions for number that I've seen before include "For example, one" , "Cardinal or ordinal" , "Part of musical" , "Count - a digit?" , "(Symbol for) quantity" .)

I've seen this clue in The Guardian.

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