In favour of job suggestion (11)
I believe the answer is:
proposition
'suggestion' is the definition.
(I know that suggestion can be written as proposition)
'in favour of job' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'job' becomes 'position' (position is a kind of job).
'pro'+'position'='PROPOSITION'
(Other definitions for proposition that I've seen before include "to try to get off with" , "Suggestion put forward" , "Scheme" , "Suggested plan" , "Offer" .)