Full of enthusiasm (6)
I believe the answer is:
ardent
'full of enthusiasm' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ardent that I've seen before include "Warm and loving" , "Passionate and glowing" , "'Fervent, impassioned (6)'" , "Burning, passionate" , "very interested" .)