Exact time (6)

I believe the answer is:

minute

I believe this is a double definition.

'exact' is the first definition.
(I've seen this before)

'time' is the second definition.
(unit of time)

(Other definitions for minute that I've seen before include "Immeasurably small" , "Small amount of time" , "Formal note" , "Extremely small" , "Precise" .)

I've seen this clue in The Sun and The Guardian.

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