Crossword Genius

How the hungry slimmer's resolve not to eat it may? (7)

Ross

I believe the answer is:

crumble

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'may?' is the definition.
Although both the answer and definition are verbs in their base form, 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 crumble that I've seen before include "Break into small fragments" , "Gradually disintegrate" , "Type of pudding - disintegrate" , "Break up - fruit dish" , "Break up - pudding" .)

I've seen this clue in the Evening Standard.
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