Campaign to overhaul used car (7)
I believe the answer is:
crusade
'campaign' is the definition.
(I know that crusade is a kind of campaign)
'overhaul used car' is the wordplay.
'used car' anagrams to 'CRUSADE'.
However, I am not sure how this is indicated.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for crusade that I've seen before include "Drive" , "Holy war" , "Advertising campaign" , "Religious war" , "Vigorous campaign" .)