Crossword Genius

Keen to back singer (4)

Ross

I believe the answer is:

avid

'keen' is the definition.
(I've seen this in other clues)

'back singer' is the wordplay.
'back' says the letters should be written backwards.
'singer' becomes 'diva' (diva can mean a female opera singer).
'diva' backwards is 'AVID'.

'to' acts as a link.

(Other definitions for avid that I've seen before include "'Eager, enthusiastic (4)'" , "Extremely enthusiastic" , "Showing active interest and enthusiasm" , "Fanatical" , "'Eager, zealous (4)'" .)

I've seen this clue in The Guardian.
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