Core user adapted source of help (8)
I believe the answer is:
recourse
'source of help' is the definition.
'recourse' can be an answer for 'help' (recourse is a kind of help). I'm not sure about the 'source of' bit.
'core user adapted' is the wordplay.
'adapted' is an anagram indicator.
'core'+'user'='coreuser'
'coreuser' is an anagram of 'RECOURSE'.
Can you help me to learn more?
(Other definitions for recourse that I've seen before include "Facility" , "Expedient" , "A source of help, like resource" , "Source of aid in troubles" , "A source of help in a difficult situation" .)