Issue certainly not arising when expected (2,4)
I believe the answer is:
on time
'expected' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'issue certainly not arising' is the wordplay.
'issue' becomes 'emit' (both can mean to give out or radiate).
'certainly not' becomes 'no'.
'arising' says the letters should be written backwards.
'emit'+'no'='emitno'
'emitno' written backwards gives 'ON TIME'.
'when' is the link.
Can you help me to learn more?
(Other definitions for on time that I've seen before include "(Of train) not late" , "without delay" , "as expected" , "promptly" , "Prompt" .)