Crossword Genius

Eager, opera star to return (4)

Ross

I believe the answer is:

avid

'eager' is the definition.
(synonyms)

'opera star to return' is the wordplay.
'opera star' becomes 'diva' (diva can mean a female opera singer).
'to return' says the letters should be written in reverse.
'diva' reversed gives 'AVID'.

(Other definitions for avid that I've seen before include "Impassioned about diva" , "Extremely enthusiastic" , "Showing a very keen interest in something" , "Excessively keen" , "Mad for diva" .)

I've seen this clue in The Telegraph.
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