Very much in love (7)
I believe the answer is:
smitten
'very much in love' is the definition.
(as in being smitten with someone)
This is the entire clue.
(Other definitions for smitten that I've seen before include "Head over heels in love" , "Afflicted by foolish fondness" , "Affected by something overwhelming" , "Charmed" , "Affected or struck by, disease or desire" .)