Feel good in a crazy way (4)

I believe the answer is:

amok

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'in a crazy way' is the definition.
I can't judge whether this definition defines the answer.

'feel good' is the wordplay.
'feel' becomes 'am' (I can't explain this - if you can you should give a lot more credence to this answer).
'good' becomes 'ok'.
'am'+'ok'='AMOK'

Can you help me to learn more?

(Other definitions for amok that I've seen before include "Run thus to be wild and uncontrolled" , "Wild and uncontrollable" , "Run (disruptively out of control)" , "crazy" , "Run thus to run wildly about" .)

I've seen this clue in The Guardian.

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