Eager, enthusiastic (4)
I believe this is a double definition.
'eager' is the first definition.
(synonyms)
'enthusiastic' is the second definition.
(similar in meaning)
(Other definitions for avid that I've seen before include "Keen or greedy" , "Extremely enthusiastic" , "'Eager, zealous (4)'" , "Burning" , "Greedy like diva" .)
I believe this is a double definition.
'eager' is the first definition.
(I've seen this in another clue)
'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" .)