Something to ride waves on (9)
I believe the answer is:
surfboard
(Other definitions for surfboard that I've seen before include "Wave rider's support" , "Wave rider" , "This may be ridden in the main" , "Plank for riding the waves" .)
I believe the answer is:
surfboard
(Other definitions for surfboard that I've seen before include "Wave rider's support" , "Wave rider" , "This may be ridden in the main" , "Plank for riding the waves" .)