Might such rhetoric be no great shakes? (7)
I believe the answer is:
litotes
'might' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for litotes that I've seen before include "Possibly, no small surprise" , "Literary use of understatement" , "in which not a little is a lot?" , "no overstatement" , "Understatement for rhetorical effect" .)