David Lynch hides with enthusiasm (6)
I believe the answer is:
avidly
'with enthusiasm' is the definition.
(avid can mean enthusiastic)
'david lynch hides' is the wordplay.
'hides' indicates the answer is hidden within the clue.
'AVIDLY' is hidden in the letters of 'david lynch'.
(Other definitions for avidly that I've seen before include "Though exhibiting great zeal" , "with enthusiasm" , "Keenly, eagerly" , "Eagerly, maybe greedily" , "with a lot?" .)