Posh and learned person finds employment (5)
I believe the answer is:
usage
'employment' is the definition.
(I know that employment can be written as usage)
'posh and learned person' is the wordplay.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'and' is a charade indicator (letters next to each other).
'learned person' becomes 'sage' (I've seen this in another clue).
'u'+'sage'='USAGE'
'finds' is the link.
(Other definitions for usage that I've seen before include "Usual practice" , "linguistic custom?" , "Treatment, practice" , "Style of language" , "Way of employing" .)