Extremely enthusiastic (4)
'extremely enthusiastic' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for zealous that I've seen before include "'Enthusiastic, keen (7)'" , "Full of earnest enthusiasm" , "Impassioned" , "Very devoted to a cause" , "Dedicated" .)
'extremely enthusiastic' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for avid that I've seen before include "'Eager, enthusiastic (4)'" , "Keenly interested" , "Fervent" , "Showing active interest and enthusiasm" , "Greedily eager" .)