Teller of little lies (6)
I believe the answer is:
fibber
'teller of little lies' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fibber that I've seen before include "Person telling small lies, perhaps a child" , "Teller of white lies" , "One who tells porkies" , "Liar" , "Teller of little lies" .)