Spring turning pale (4)
I believe the answer is:
leap
'spring' is the definition.
(both can mean to jump)
'turning pale' is the wordplay.
'turning' indicates anagramming the letters.
'pale' anagrammed gives 'LEAP'.
(Other definitions for leap that I've seen before include "vault" , "Jump; type of year" , "Basket" , "as 1984 was" , "Jump, spring" .)