Crossword Genius

Revolution in each canton? That won't happen! (3,1,6)

Ross

I believe the answer is:

not a chance

I'm a little stuck... Click here to teach me more about this clue!

'that won't happen' is the definition.
(I've seen this before)

'revolution in each canton?' is the wordplay.
'each canton' anagrams to 'NOT A CHANCE'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for not a chance that I've seen before include "That won't happen" , "on your bike?" .)

I've seen this clue in The Telegraph.
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