Actor’s remarkable at reading (9)
I believe the answer is:
tragedian
'actor's' is the definition.
(tragedian is a kind of actor)
'remarkable at reading' is the wordplay.
'remarkable' indicates an anagram.
'at'+'reading'='atreading'
'atreading' anagrammed gives 'TRAGEDIAN'.
(Other definitions for tragedian that I've seen before include "actor in Macbeth?" , "Dramatist" , "Egad, I rant about dramatic actor" , "Egad, I rant about actor in sad drama" , "Serious actor" .)