Carefree barbarian, losing head, takes money in empty toolshed (10)

I believe the answer is:

untroubled

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

'barbarian losing head takes money in empty toolshed' is the wordplay.
'barbarian' becomes 'hun' (as in Atilla the Hun).
'losing head' means to remove the first letter.
'takes money' becomes 'rouble' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'empty' says to hollow out the word (remove centre letters).
'toolshed' with its middle taken out is 'td'.
'hun' with its first letter removed is 'un'.
'rouble' going into 'td' is 'troubled'.
'un'+'troubled'='UNTROUBLED'

Can you help me to learn more?

(Other definitions for untroubled that I've seen before include "Not anxious" , "Composed" , "Calm, tranquil" .)

I've seen this clue in the Sydney Morning Herald.

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