Jump lead (5)

I believe the answer is:

start

I believe this clue is a double definition.

'jump' is the first definition.
('start' can be a synonym of 'jump')

'lead' is the second definition.
(thesaurus)

(Other definitions for start that I've seen before include "launch" , "Begin - opening move" , "open" , "get under way" , "Begin to recoil?" .)

I've seen this clue in The Telegraph.

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