Not Monty, though concerned in disrobing (5)
I believe the answer is:
robin
'not monty though concerned' is the definition.
I can't judge whether this definition defines the answer.
'in disrobing' is the wordplay.
'in' says the answer is hidden in the clue.
'ROBIN' is hidden in the letters of 'disrobing'.
Can you help me to learn more?
(Other definitions for robin that I've seen before include "Friendly winter bird" , "Hood, possibly" , "Day was one" , "Small brown thrush" , "Traditional Christmas card bird" .)