Legendary golden sovereign (5)
I believe the answer is:
midas
'legendary golden sovereign' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for midas that I've seen before include "Legendary king whose touch turned things to gold" , "Phrygian king" , "King who turned what he touched to gold" , "Legendary king who could turn everything to gold" , "Gold-making king" .)