Japanese entertainer falsifying his age (6)
I believe the answer is:
geisha
'japanese entertainer' is the definition.
(I've seen this before)
'falsifying his age' is the wordplay.
'falsifying' indicates an anagram.
'his'+'age'='hisage'
'hisage' is an anagram of 'GEISHA'.
(Other definitions for geisha that I've seen before include "Japanese serving girl" , "Japanese hostess trained to entertain men" , "Professional female companion in Japan" , "He's a GI (anag.)" , "Japanese paid companion" .)