Very brief moment (5,6)

I think it could be either:

Which length description are you looking for?:

5,6

split second

'very brief moment' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for split second that I've seen before include "Twinkling of an eye" , "Very little time" , "Very brief moment of time" , "An extremely short time" , "Instant" .)

I've seen this clue in The Guardian.

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