By the end of November, any red variety of fox (7)
I believe the answer is:
reynard
'fox' is the definition.
(I know that Reynard is a type of fox)
'by the end of november any red variety' is the wordplay.
'by' means one lot of letters go next to another.
'the end of' indicates one should take the final letters.
'variety' indicates an anagram.
The last letter of 'november' is 'r'.
'any'+'red'='anyred'
'anyred' with letters rearranged gives 'eynard'.
'r' next to 'eynard' is 'REYNARD'.
'of' is the link.
(Other definitions for reynard that I've seen before include "Archetypal name for a fox" , "Name for the fox in fable and folklore" , "Traditional name for a fox" , "Crafty type" , "Fox as trickster figure" .)