In RADA, get trained actor (9)
I believe the answer is:
tragedian
'actor' is the definition.
(tragedian is a kind of actor)
'in rada get trained' is the wordplay.
'trained' indicates anagramming the letters (to train can mean to grow something into a shape).
'in'+'rada'+'get'='inradaget'
'inradaget' is an anagram of 'TRAGEDIAN'.
(Other definitions for tragedian that I've seen before include "Dramatist" , "Egad, I rant about dramatic actor" , "Serious actor" , "A great din (anag) - actor" , "Egad, I rant about actor in sad drama" .)