Entertaining lady betrays his age (6)
I believe the answer is:
geisha
'entertaining lady' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'betrays his age' is the wordplay.
'his age' can be anagrammed to 'GEISHA'.
But, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for geisha that I've seen before include "Jap. entertainer" , "Japanese hostess trained to entertain men" , "He's a GI (anag.)" , "Japanese hostess who entertains men" , "One employed to look after men" .)