Show new spirit (5)
I believe the answer is:
demon
'spirit' is the definition.
(I know that demon is a type of evil spirit)
'show new' is the wordplay.
'show' becomes 'demo' (I've seen this before).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'demo'+'n'='DEMON'
(Other definitions for demon that I've seen before include "Inspiring force" , "ace" , "See 3" , "beast" , "Evil spirit, devil" .)