Experience again having energy to alleviate (7)
I believe the answer is:
relieve
'to alleviate' is the definition.
(synonyms)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for relieve that I've seen before include "Assuage - take over duty from" , "Take over (from) - ease worries (of)" , "Take over work from someone" , "Ease pain or burden" , "Alleviate 9pain)" .)