Liberally, mask job making rhino-leather whip (7)
I believe the answer is:
sjambok
'whip' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?
'liberally mask job making rhino-leather' is the wordplay.
'mask job' can be anagrammed to 'SJAMBOK'.
However, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for sjambok that I've seen before include "Afrikaans whip" , "Rhinoceros whip" .)