Religious follower, convert, in this car (9)
I believe the answer is:
christian
'religious follower' is the definition.
'Christian' can be an answer for 'follower' (thesaurus). I'm not certain of the 'religious' bit.
'convert in this car' is the wordplay.
'convert' indicates an anagram (I've seen this in other clues).
'in'+'this'+'car'='inthiscar'
'inthiscar' is an anagram of 'CHRISTIAN'.
Can you help me to learn more?
(Other definitions for christian that I've seen before include "One follows the teachings of Jesus Christ" , "Can rich saint be in universal church?" , "Rich saint becomes member of church" , "Eg, an Anglican" .)