Good party organisers will provide spirits (6)
I believe the answer is:
ghosts
'spirits' is the definition.
(ghost is a kind of spirit)
'good party' is the wordplay.
'good' becomes 'g' (abbreviation).
'party' becomes 'hosts' (I can't justify this - if you can you should give a lot more credence to this answer).
'g'+'hosts'='GHOSTS'
'organisers will provide' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ghosts that I've seen before include "Apparitions of a dead people" , "Spectres, wraiths" , "Spirits or apparitions" , "Writes for another; Ibsen play" , "Spooks, spectres" .)