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Treatment costs nothing, so unconcerned (8)

Ross

I believe the answer is:

carefree

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'unconcerned' is the definition.
(similar in meaning)

'treatment costs nothing' is the wordplay.
'treatment' becomes 'care' (I've seen this in another clue).
'costs nothing' becomes 'free' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'care'+'free'='CAREFREE'

'so' is the link.

Can you help me to learn more?

(Other definitions for carefree that I've seen before include "Without anxiety or responsibilities" , "Unconstrained" , "Jaunty" , "Untroubled" , "Happy and blithe - no worries" .)

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