Insatiable drama queen stood up (4)
I believe the answer is:
avid
'insatiable' is the definition.
(thesaurus)
'drama queen stood up' is the wordplay.
'drama queen' becomes 'diva'.
'stood up' is a reversal indicator (in a down clue, letters go up).
'diva' back-to-front is 'AVID'.
(Other definitions for avid that I've seen before include "Excessively keen" , "Greatly desirous" , "Greedy like diva" , "Fervent" , "Keen, enthusiastic" .)