Become habit-free? (7)

I believe the answer is:

undress

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'become habit-free?' is the definition.
I can't tell whether this defines the answer.

'become habit' is the wordplay.
'become' becomes 'un' (I am not sure about this - if you are sure you should believe this answer much more).
'habit' becomes 'dress' (I've seen this before).
'un'+'dress'='UNDRESS'

Can you help me to learn more?

(Other definitions for undress that I've seen before include "Nudity" , "Disrobe - uniform for ordinary occasions" , "Remove one's clothes" , "Take one's clothes off" , "Remove clothes, strip" .)

I've seen this clue in The Globe and Mail.

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