Idle phrase wrecked authorised business (10)
I believe the answer is:
dealership
'business' is the definition.
(I know that dealership is a type of business)
'idle phrase wrecked' is the wordplay.
'wrecked' indicates an anagram.
'idle'+'phrase'='idlephrase'
'idlephrase' anagrammed gives 'DEALERSHIP'.
'authorised' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for dealership that I've seen before include "Car franchise" , "car showroom?" , "Franchise to sell for a company" , "Car sales outlet" , "Business" .)