Observed, witnessed (4)

I believe the answer is:

seen

I believe this is a double definition.

'observed' is the first definition.
(synonyms)

'witnessed' is the second definition.
(similar in meaning)

(Other definitions for seen that I've seen before include "Espied" , "Spotted" , "watched" , "Met - understood" , "Distinguished" .)

I've seen this clue in The Times.

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