Eager, enthusiastic (4)

I think it could be either:

avid

keen

I believe this is a double definition.

'eager' is the first definition.
(I've seen this before)

'enthusiastic' is the second definition.
(I've seen this before)

(Other definitions for keen that I've seen before include "Anxious" , "Longing" , "devoted" , "Eager; wail in grief" , "Eager; dirge" .)

I've seen this clue in The Guardian and The Times.

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