A brilliant performer’s noted, so you look (5)
I believe the answer is:
stare
'look' is the definition.
(stare is a kind of look)
'a brilliant performer's noted so you' is the wordplay.
'a brilliant performer' becomes 'star' (I've seen this before).
'noted so you' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'star'+'e'='STARE'
Can you help me to learn more?
(Other definitions for stare that I've seen before include "Look with fixed gaze" , "Gaze fixedly" , "Long fixed look" , "bird" , "Rates (anag.)" .)