Pantera bassist Brown (3)
I believe the answer is:
rex
'pantera bassist brown' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rex that I've seen before include "King (L.)" , "King (Latin); cat breed" , "Dog's name; king" , "Oedipus - -" , "King's title" .)