She has awful breath (6)
I believe the answer is:
bertha
'she' is the definition.
'awful breath' is the wordplay.
'awful' is an anagram indicator.
'breath' is an anagram of 'BERTHA'.
'has' acts as a link.
(Other definitions for bertha that I've seen before include "Woman's name" , "Big ..., heavy German howitzer in World War 1" , "Big girl" , "big woman?" , "Big - - , WW1 gun" .)