Leather works against family relations (8)

I believe the answer is:

buckskin

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'leather' is the definition.
(buckskin is a kind of leather)

'works against family relations' is the wordplay.
'works against' becomes 'bucks' (I can't justify this - if you can you should believe this answer much more).
'family relations' becomes 'kin' (I've seen this in another clue).
'bucks'+'kin'='BUCKSKIN'

Can you help me to learn more?

(Other definitions for buckskin that I've seen before include "horse" , "Soft, yellowish suede leather" , "Type of leather" , "Soft leather or wool fabric" .)

I've seen this clue in the Sydney Morning Herald.

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