Uncle Remus's vulpine brother (4,3)
I believe the answer is:
brer fox
'uncle remus's vulpine' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'brother' is the wordplay.
I cannot quite see how this works, but
'brother' could be 'br' (abbreviation in titles of monks) and 'br' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for brer fox that I've seen before include "He "lay low"" , "Uncle Remus character" .)