Witness, watch (7)

I believe the answer is:

observe

This clue is a double definition.

'witness' is the first definition.
(I've seen this in another clue)

'watch' is the second definition.
(observing is a kind of watching)

(Other definitions for observe that I've seen before include "monitor" , "Witness, watch" , "Keep - watch" , "taking notice" , "Watch closely" .)

I've seen this clue in The Telegraph and The Times.

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