Masters not confused by this medley (10)
I believe the answer is:
assortment
'this medley' is the definition.
(I've seen this before)
'masters not confused' is the wordplay.
'confused' indicates an anagram.
'masters'+'not'='mastersnot'
'mastersnot' anagrammed gives 'ASSORTMENT'.
'by' is the link.
(Other definitions for assortment that I've seen before include "Miscellaneous collection" , "Medley" , "Variety" , "Mixture" , "salmagundi" .)