Crossword Genius

Very enthusiastic man losing head (4)

Ross

I believe the answer is:

avid

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'very enthusiastic' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for avid that I've seen before include "Keenly enthusiastic" , "Fervent" , "Eager like diva" , "Fanatical" , "'Eager, zealous (4)'" .)

I've seen this clue in The Sun.
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