Ancient overseer refined sugar (5)
I believe the answer is:
argus
'ancient overseer' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'refined sugar' is the wordplay.
'refined' indicates an anagram.
'sugar' anagrammed gives 'ARGUS'.
Can you help me to learn more?
(Other definitions for argus that I've seen before include "Many-eyed mythical monster" , "Small butterfly" , "Pheasant, butterfly, a hundred-eyed monster" , "Various brown butterflies" , "Hundred-eyed giant in mythology" .)