Demoralize (8)
I believe the answer is:
dispirit
'demoralize' is the definition.
(I know that demoralize can be written as dispirit)
This is the entire clue.
(Other definitions for dispirit that I've seen before include "Deject, dishearten" , "Make hopeless" , "Discourage" , "Cause to feel low or depressed" , "Cause to be downhearted" .)