Sparkle of Greek character initially accepted among Zulus (7)

'sparkle' is the definition.
(pizzazz can mean sparkle or glamour)

'greek character initially accepted among zulus' is the wordplay.
'greek character' becomes 'pi' (letter from the Greek alphabet).
'initially' says to take the initial letters.
'among' indicates putting letters inside.
'zulus' becomes 'ZZZZ' (Zulu is Z in the phonetic alphabet).
The initial letter of 'accepted' is 'a'.
'a' put into 'zzzz' is 'zzazz'.
'pi'+'zzazz'='PIZZAZZ'

'of' is the link.