Pilot raised issue before event (4,5)
I believe the answer is:
Here is my best explanation:
'event' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?
'pilot raised issue before' is the wordplay.
'pilot' becomes 'trial' ('trial' can be a synonym of 'pilot'**).
'raised' says the letters should be written in reverse.
'issue' becomes 'emit' (I've seen this before).
'before' is a charade indicator (letters next to each other).
'emit' written backwards gives 'time'.
'trial' put after 'time' is 'TIME TRIAL'.
(Other definitions for time trial that I've seen before include "cycling event", "Race against the clock", "Cycling event" and "test".)