Justify one's desire to get hold of an expensive car (7)
I believe the answer is:
warrant
'justify one's' is the definition.
'warrant' can be an answer for 'justify' (synonyms). I am not certain of the 'one's' bit.
'desire to get hold of an expensive car' is the wordplay.
'desire' becomes 'want' (synonyms).
'to get hold of' indicates putting letters inside.
'an' becomes 'a'.
'expensive car' becomes 'rr' (abbreviation for Rolls Royce).
'a'+'rr'='arr'
'want' going around 'arr' is 'WARRANT'.
Can you help me to learn more?
(Other definitions for warrant that I've seen before include "Call for" , "Guaranty - authorisation to make an arrest" , "Permit for arrest, search of premises, etc" , "Merit, justify" , "Writ for arrest" .)