Ron seem upset, Roy? (7)
I believe the answer is:
emerson
'roy?' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I can't see?
'ron seem upset' is the wordplay.
'upset' indicates anagramming the letters.
'ron'+'seem'='ronseem'
'ronseem' anagrammed gives 'EMERSON'.
Can you help me to learn more?
(Other definitions for emerson that I've seen before include "he could write!" , "Ralph Waldo --, US essayist" , "American author, 1803-82" , "Ralph Waldo . . ., 19th century American philosopher and poet" , "American writer, 1803-82" .)