Fish travel on ice (5)
I believe the answer is:
skate
'fish' is the definition.
(skate is a kind of fish)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for skate that I've seen before include "Takes off like large flatfish" , "Fish of ray family" , "Ice-gliding blade; fish" , "Complete, 19-less" , "Large, edible rays" .)