Kind hearted, work undone by aspersion (8)
I believe the answer is:
innuendo
'aspersion' is the definition.
(insinuating statement)
'kind hearted work undone' is the wordplay.
'hearted' indicates the central letters.
'work' is an anagram indicator.
The centre of 'kind' is 'in'.
'undone' anagrammed gives 'nuendo'.
'in'+'nuendo'='INNUENDO'
'by' acts as a link.
(Other definitions for innuendo that I've seen before include "Naughty suggestion" , "An unpleasant insinuation or intimation" , "Disparaging suggestion" , "Oblique allusion" , "Aspersion" .)