Creator of famous solver given good position (7)
I believe the answer is:
ranking
'position' is the definition.
(I know that position can be written as ranking)
'creator of famous solver given good' is the wordplay.
'creator of famous solver' becomes 'Rankin' (Ian Rankin, creator of Inspector John Rebus).
'given' says to put letters next to each other.
'good' becomes 'g' (abbreviation).
'rankin'+'g'='RANKING'
(Other definitions for ranking that I've seen before include "position on graded scale" , "Assigning a position to" , "Classification" , "Position in a hierarchy" , "Status" .)