Flying speed? (3)

I believe the answer is:

bat

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This clue might be a double definition.

'flying' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'speed?' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for bat that I've seen before include "once wielded by 60 [GREIG]" , "Night flier" , "Night-flyer" , "Nocturnal animal - racket" , "Wooden implement for cricket" .)

I've seen this clue in the Evening Standard.

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