Custom I'm not going to obey! (4)
I believe the answer is:
wont
'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" .)