Moving rapidly (6)

I think it could be either:

Which length description are you looking for?:

flying

'moving rapidly' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for flying that I've seen before include "& 20 Maritime aircraft" , "Moving quickly" , "-- boat; -- buttress" , "''Those magnificent men in their ... machines'' (film theme song)" , "Travelling by plane" .)

I've seen this clue in The Guardian.

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