New fiddle not seeing debut in gentle movement (5)
I believe the answer is:
nudge
'gentle movement' is the definition.
'new fiddle not seeing debut' is the wordplay.
'new' becomes 'n'.
'fiddle' becomes 'fudge' (both can mean to scam).
'not seeing debut' means to remove the first letter.
'fudge' with its first letter removed is 'udge'.
'n'+'udge'='NUDGE'
'in' acts as a link.
(Other definitions for nudge that I've seen before include "Prod gently with elbow" , "suggestive move" , "Jog" , "Festive entertainment" , "Jostle" .)