The load burned out (6)
I believe the answer is:
burden
'the load' is the definition.
('burden' can be a synonym of 'load')
'burned out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'burned' anagrammed gives 'BURDEN'.
(Other definitions for burden that I've seen before include "Weigh down - load" , "Oppressive duty" , "Load or responsibility carried" , "A heavy load or difficulty" , "Encumbrance" .)