Some dancers on ice very fast (5)
I believe the answer is:
sonic
'very fast' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I don't see?
'some dancers on ice' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'SONIC' is hidden within 'dancers on ice'.
Can you help me to learn more?
(Other definitions for sonic that I've seen before include "Travelling at Mach One" , "Boom of jet aircraft" , "Kind of boom" , "Sort of boom" , "Type of boom" .)