Crossword Genius

Custom I'm not going to obey! (4)

Ross

I believe the answer is:

wont

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

'custom' is the definition.
(I know that wont is a type of custom)

'i'm not going to obey' is the wordplay.
I cannot quite see how this works, but
an anagram of 'not' is 'ont' which is located in the answer.
A single letter 'w' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for wont that I've seen before include "Is not going to" , "customary behaviour" , "Action habitually associated with someone" , "Accustomed" , "normal practice" .)

I've seen this clue in The Times.
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