Writer of dull study (6)
I believe the answer is:
dryden
'writer' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?
'dull study' is the wordplay.
'dull' becomes 'dry' (I've seen this in another clue).
'study' becomes 'den' (term for a study or office).
'dry'+'den'='DRYDEN'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for dryden that I've seen before include "man behind lines?" , "17th century English poet and dramatist" , "Amphitryon was his" , "John -, English seventeenth century poet, dramatist" , "Restoration author" .)