Stella met hysteria, displaying jewel (8)
I believe the answer is:
amethyst
'jewel' is the definition.
(I know that amethyst is a type of jewel)
'stella met hysteria displaying' is the wordplay.
'displaying' says the answer is hidden in the clue.
'AMETHYST' is hidden in the letters of 'stella met hysteria'.
(Other definitions for amethyst that I've seen before include "Violet gemstone" , "Purple quartz used in jewellery" , "Bluish-violet 3" , "Something precious" , "Precious stone of purple quartz" .)