Words said in fun (4)
I believe the answer is:
jest
'words said in fun' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for jest that I've seen before include "Joke, fool about" , "In ____, playfully" , "fun" , "` `Many a true word is spoken in . . . .' '" , "Sally" .)