Goes quickly sorting the files (5)

I believe the answer is:

flies

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'goes' is the definition.
(flying is a kind of going)

'quickly sorting the files' is the wordplay.
'files' anagrams to 'FLIES'.
Though, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for flies that I've seen before include "Insects; goes quickly" , "Trouser zip area -- travels through the air" , "Insects; passes swiftly" .)

I've seen this clue in the Evening Standard.

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