Hugely successful entertainer reinvented as art gem (8)
I believe the answer is:
megastar
'hugely successful entertainer' is the definition.
'megastar' can be an answer for 'entertainer' (I have seen 'famous entertainer' mean 'megastar' so perhaps 'entertainer' could also mean 'megastar'). I'm unsure of the 'hugely successful' bit.
'reinvented as art gem' is the wordplay.
'reinvented' is an anagram indicator.
'as'+'art'+'gem'='asartgem'
'asartgem' is an anagram of 'MEGASTAR'.
Can you help me to learn more?
(Other definitions for megastar that I've seen before include "Sensational person" , "Dazzlingly successful person" , "Very famous person" , "famous entertainer" , "major celeb" .)