Charm of eccentric A-list chap? (8)
I believe the answer is:
talisman
'charm' is the definition.
('talisman' can be a synonym of 'charm')
'eccentric a-list chap?' is the wordplay.
'eccentric' indicates an anagram.
'chap?' becomes 'man'.
'a'+'list'='alist'
'alist' is an anagram of 'talis'.
'talis'+'man'='TALISMAN'
'of' is the link.
(Other definitions for talisman that I've seen before include "Object supposed to bring good luck" , "Good luck token" , "Object thought to guard against evil" , "Magically protective object" , "bringer of luck?" .)