Spirit shown by good party organiser (5)
I believe the answer is:
ghost
'spirit' is the definition.
(ghost is a kind of spirit)
'shown by good party organiser' is the wordplay.
'shown by' is a charade indicator (letters next to each other).
'good' becomes 'g' (abbreviation).
'party organiser' becomes 'host'.
'g' put next to 'host' is 'GHOST'.
(Other definitions for ghost that I've seen before include "who has a haunting act?" , "Writer who gives the credit of authorship to someone else" , "suggestion" , "A spirit from the beyond" , "Spirit, spectre" .)