Not an index of the famous (7)
I believe the answer is:
notable
'the famous' is the definition.
(I've seen this before)
'not an index' is the wordplay.
'not' becomes 'no' (I've seen this in other clues).
'an index' becomes 'table' (I've seen this before).
'no'+'table'='NOTABLE'
'of' is the link.
(Other definitions for notable that I've seen before include "Impressive" , "Big noise" , "Significant or distinguished" , "Celebrated" , "Star" .)