Adversary bound to disregard English rank (6)
I believe the answer is:
foetid
'rank' is the definition.
(I've seen this before)
'adversary bound to disregard english' is the wordplay.
I cannot really understand how this works, but
'adversary' could be 'foe' (I've seen this before) and 'foe' is located in the answer.
The remaining letters 'tid' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for foetid that I've seen before include "Evil-smelling" , "Smelling unpleasant" , "Smelly" , "rank" , "Foul-smelling" .)