Forward, endlessly holding hand? Must be in love? (7)
I believe the answer is:
smitten
'in love?' is the definition.
('smitten' can be a synonym of 'in love')
'forward endlessly holding hand? must be' is the wordplay.
'forward' becomes 'unreserved'.
'endlessly' says to take the centre (the ends of the words are removed).
'holding' is an insertion indicator.
'hand?' becomes 'mitt' ('mitt' can be a synonym of 'hand').
'must be' becomes 'n' (I can't justify this - if you can you should believe this answer much more).
The middle letters of 'unreserved' are 'se'.
'se' going around 'mitt' is 'smitte'.
'smitte'+'n'='SMITTEN'
Can you help me to learn more?
(Other definitions for smitten that I've seen before include "Besotted, enamoured" , "Infatuated with mittens" , "Charmed" , "Struck (by love?)" , "Severely affected (by something)" .)