Generous availability of anaesthetics? (7)

I believe the answer is:

numbers

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'anaesthetics?' is the definition.
(things that make things numb)

I don't understand how the rest of the clue works.

(Other definitions for numbers that I've seen before include "Amounts; counts" , "Biblical book - anaesthetics" , "Integers" , "quantity" , "OT Book 4" .)

I've seen this clue in the Evening Standard.

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