During trip, plenty wave (6)
I believe the answer is:
ripple
'wave' is the definition.
(I know that ripple is a type of wave)
'during trip plenty' is the wordplay.
'during' indicates a hidden word.
'RIPPLE' is hidden within 'trip plenty'.
(Other definitions for ripple that I've seen before include "A small wave, or a gentle sound as of laughter" , "Slight disturbance on water's surface" , "Slight surface wave" , "Light ruffle on the surface" , "Slight disturbance on surface of lake" .)