Good party-giver offers spirit (5)
I believe the answer is:
ghost
'spirit' is the definition.
(I know that ghost is a type of spirit)
'good party-giver' is the wordplay.
'good' becomes 'g' (abbreviation).
'party-giver' becomes 'host' (I've seen this in another clue).
'g'+'host'='GHOST'
'offers' acts as a link.
(Other definitions for ghost that I've seen before include "insubstantial presence" , "21 [WRAITH]" , "Spirit, spectre" , "One's dying to" , "Phantom" .)