Kinsman's account (8)
I believe the answer is:
relation
I believe this clue is a double definition.
'kinsman's' is the first definition.
(thesaurus)
'account' is the second definition.
(I've seen this before)
(Other definitions for relation that I've seen before include "One of the family" , "Auntie?" , "report" , "Eg, father" , "Kin" .)