Gold sovereign? (5)
I believe the answer is:
midas
'gold sovereign?' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
Can you help me to learn more?
(Other definitions for midas that I've seen before include "Mythical king with golden touch" , "I'm sad (anag) -- king of Phrygia" , "Legendary king whose touch turned anything to gold" , "Everything he touched turned to gold" , "Phrygian king" .)