Kitty accepts eastern writer (4)
I believe the answer is:
poet
'writer' is the definition.
(I know that poet is a type of writer)
'kitty accepts eastern' is the wordplay.
'kitty' becomes 'pot' (both can mean a shared fund).
'accepts' means one lot of letters goes inside another.
'eastern' becomes 'e'.
'pot' enclosing 'e' is 'POET'.
(Other definitions for poet that I've seen before include "author" , "One writing verse" , "Bard" , "Masefield, for instance" , "Minstrel" .)