Nonchalant in dealings with auctions (10)
I believe the answer is:
insouciant
'nonchalant' is the definition.
(I know that nonchalant can be written as insouciant)
'in dealings with auctions' is the wordplay.
I cannot really see how this works, but
'in' is present in the answer.
an anagram of 'auctions' is 'souciant' which is within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for insouciant that I've seen before include "Light-hearted - in auctions (anag)" , "Not concerned" , "Laid-back" , "Carefree, heedless" , "Untroubled" .)