Use English, having observed (4)

I believe the answer is:

seen

'observed' is the definition.
(synonyms)

'use english having' is the wordplay.
'having' indicates a hidden word.
'SEEN' is hidden within 'use english'.

(Other definitions for seen that I've seen before include "Espied" , "Observed or percieved" , "Witnessed" , "Sighted" , "Met - understood" .)

I've seen this clue in The Mirror.

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