Lashes out in struggle (6)
I believe the answer is:
hassle
'struggle' is the definition.
(hassle is a kind of struggle)
'lashes out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'lashes' with letters rearranged gives 'HASSLE'.
'in' acts as a link.
(Other definitions for hassle that I've seen before include "Pester or annoy" , "argument" , "Informally, annoyance or quarrel" , "Struggle" , "Hound" .)