A job with the French champion (7)
I believe the answer is:
apostle
'champion' is the definition.
(I know that apostle is a type of believer)
'a job with the french' is the wordplay.
'job' becomes 'post' (post is a kind of job).
'with' means one lot of letters go next to another.
'the french' becomes 'le' ('the' in French).
'a'+'post'+'le'='APOSTLE'
(Other definitions for apostle that I've seen before include "Early Christian missionary" , "Holy person" , "eg John, Paul" , "Originally, one sent to preach the gospel" , "Ale pots (anag)" .)