In a foxy fashion (5)
I believe the answer is:
slyly
'in a foxy fashion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for slyly that I've seen before include "Craftily, cunningly" , "in underhand way" , "In a stealthy and secret way" , "In a cunning manner" .)