Wage produced from plain writing? Sweet! (9)
I believe the answer is:
prosecute
'wage' is the definition.
(thesaurus)
'writing? sweet' is the wordplay.
'writing?' becomes 'prose' (prose is ordinary writing as opposed to poetry).
'sweet' becomes 'cute' (cute can mean sweet or adorable).
'prose'+'cute'='PROSECUTE'
'produced from plain' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for prosecute that I've seen before include "Practise" , "Represent the Crown in court" , "Bring before a criminal court" , "Sue" , "Pursue" .)