Ice skater's jump (4)
I believe the answer is:
axel
'ice skater's jump' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for axel that I've seen before include "Jump executed on ice" , "Ice-skating jump" , "Manoeuvre by skater" , "part of skating performance" , "Figure skater's jump" .)