He's making a Palladium appearance (3)
I believe the answer is:
lad
'he's' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'a palladium appearance' is the wordplay.
'LAD' is hidden in amongst the letters.
But, I am unsure how this is indicated.
'making' acts as a link.
Can you help me to learn more?
(Other definitions for lad that I've seen before include "Chap, fellow" , "(Housman's Shropshire) boy" , "Youngster" , "Stable worker" , "Shaver" .)