Always entertained by Guinevere (4)

I believe the answer is:

ever

'always' is the definition.
(synonyms)

'entertained by guinevere' is the wordplay.
'entertained by' indicates the answer is hidden within the clue (the clue hosts or entertains the answer).
'EVER' is hidden within 'guinevere'.

(Other definitions for ever that I've seen before include "Continually" , "Possibly" , "At all times, always" , "On any occasion" , "constantly" .)

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