Mushy journalist tires boss out (3,6)
I believe the answer is:
sob sister
'mushy journalist' is the definition.
(journalist writing sentimental articles)
'tires boss out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'tires'+'boss'='tiresboss'
'tiresboss' is an anagram of 'SOB-SISTER'.
(Other definitions for sob sister that I've seen before include "Female journalist" , "She writes" .)