Casually unconcerned (10)

I believe the answer is:

nonchalant

'casually unconcerned' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for nonchalant that I've seen before include "Casual" , "Uncaring" , "Insouciant" , "Casually calm and relaxed" , "Calmly unconcerned" .)

I've seen this clue in The Mirror and The Independent.

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