On hand (9)

I think it could be either:

operative

available

'on hand' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for available that I've seen before include "Able to be used, free" , "To hand" , "Can be had or obtained, in stock" , "Accessible and ready for use" , "Obtainable or accessible" .)

I've seen this clue in the Evening Standard.

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