Right, some backed in radical fox (7)
I believe the answer is:
reynard
'fox' is the definition.
(I know that Reynard is a type of fox)
'right some backed in radical' is the wordplay.
I cannot quite see how this works, but
'right' could be 'ar' (I've seen this in other clues) and 'ar' is found within the answer.
'radical' could be 'r' (chemistry abbreviation) and 'r' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for reynard that I've seen before include "Crafty type" , "Traditional name for a fox" , "Archetypal name for a fox" , "Fox as trickster figure" , "Name for the fox in fable and folklore" .)