Harry lashes out (6)
I believe the answer is:
hassle
'harry' is the definition.
(I know that harry can be written as hassle)
'lashes out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'lashes' is an anagram of 'HASSLE'.
(Other definitions for hassle that I've seen before include "Annoying trouble" , "Pester or annoy" , "Wrangle" , "Colloquial harassment or annoyance" , "Struggle" .)