Paddle held by skateboarders (3)
I believe the answer is:
oar
'paddle' is the definition.
(I've seen this before)
'held by skateboarders' is the wordplay.
'held by' indicates a hidden word.
'OAR' is hidden in the letters of 'skateboarders'.
(Other definitions for oar that I've seen before include "Sportsman" , "propels floating craft" , "One of an eight" , "Boat propellant" , "Rowing blade" .)