Job application, getting rent freezes with it (14)
I believe the answer is:
apprenticeship
'job' is the definition.
(apprenticeship is a kind of job)
'application getting rent freezes with it' is the wordplay.
'application' becomes 'app'.
'getting' means one lot of letters go next to another.
'freezes' becomes 'ices' (ices over).
'with it' becomes 'hip' (both can mean cool or fashionable).
'app'+'rent'+'ices'+'hip'='APPRENTICESHIP'
(Other definitions for apprenticeship that I've seen before include "Training" , "articles" , "Period for learning a skilled trade" .)