Wish to jump with energy (4)
I believe the answer is:
hope
'wish' is the definition.
(I know that hope has the is a more specific form of the action wish)
'jump with energy' is the wordplay.
'jump' becomes 'hop' (hop is a kind of jump).
'with' means one lot of letters go next to another.
'energy' becomes 'e' (physics symbol as in E=mc2).
'hop'+'e'='HOPE'
'to' acts as a link.
(Other definitions for hope that I've seen before include "Optimism - English-born US comedian" , "Aspiration" , "Feeling of expectant desire" , "Companion to faith and charity" , "The Cape of Good -" .)