Unimportant match (5)
I believe the answer is:
light
I believe this clue is a double definition.
'unimportant' is the first definition.
(both can mean trivial)
'match' is the second definition.
(I've seen this before)
(Other definitions for light that I've seen before include "solution to clue" , "Eminent person" , "Torch" , "answer to clue" , "Radiance" .)