Bluegrass legend Scruggs (4)
I believe the answer is:
earl
'bluegrass legend scruggs' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for earl that I've seen before include "Rank below marquess" , "Count" , "A real peer" , "Countesss husband" , "Peer of the realm" .)