Retrieval from very core affected (8)
I believe the answer is:
recovery
'retrieval' is the definition.
('recovery' can be a synonym of 'retrieval')
'very core affected' is the wordplay.
'affected' indicates an anagram.
'very'+'core'='verycore'
'verycore' with letters rearranged gives 'RECOVERY'.
'from' is the link.
(Other definitions for recovery that I've seen before include "Improvement" , "Salvage" , "Retrieval or recuperation" , "Green shoots could be a sign of this" , "A return to a normal state of health" .)