... play that's of little importance? (6)
I believe the answer is:
trifle
'play' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for trifle that I've seen before include "Small beer" , "Cold dessert" , "Mess" , "A bit" , "Insignificant thing" .)