The most common and most likely answer to this crossword clue is the 7 letter word SALCHOW
I've seen this crossword clue in The Guardian
S
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Buddy explains!

The straight part
We know that "jump" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case jump = salchow.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SALCHOW mean?
SALCHOW noun- A figure skating jump with a takeoff from a back inside edge and landing on the back outside edge of the opposite foot after one or more rotations in the air.