Model left demoralised by what's brought up (6)
I believe the answer is:
raised
'what's brought up' is the definition.
(raising is a kind of bringing up)
'model left demoralised' is the wordplay.
'left' indicates named letters should be taken away.
'demoralised' with 'model' taken out is 'RAISED'.
'by' is the link.
(Other definitions for raised that I've seen before include "Lifted up or nurtured" , "Brought up, a child say" , "Moved to a higher position" , "Lifted up, elevated" , "Uplifted" .)