Unfair verdict: grasshopper or locust, maybe? (3,7)
I believe the answer is:
not cricket
'unfair' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for not cricket that I've seen before include "description of all but one type of insect" , "Almost all games are" , "so unfair" , "Unsporting" .)