Jumped left, breaking tape (5)
I believe the answer is:
leapt
'jumped' is the definition.
(I've seen this before)
'left breaking tape' is the wordplay.
'left' becomes 'l' (common abbreviation).
'breaking' is an anagram indicator.
'tape' is an anagram of 'eapt'.
'l'+'eapt'='LEAPT'
(Other definitions for leapt that I've seen before include "Jumped, sprang" , "Took off" , "gone up dramatically" , "Jumped on plate" , "Vaulted" .)