Spirit of a grand entertainer (5)
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I believe the answer is:
ghost
'spirit' is the definition.
(spirit can mean a ghost)
'grand entertainer?' is the wordplay.
'grand' becomes 'g' (G is short for grand as in a thousand).
'entertainer?' becomes 'host' (person hosting or entertaining guests).
'g'+'host'='GHOST'
'of a' is the link.
(Other definitions for ghost that I've seen before include "Spirit, spectre" , "Spirit of the dead" , "someone without much presence" , "Spectre, wraith" , "Supernatural apparition" .)