Completely opposed to providing aid (i.e., backing) for a non-imperial system (9)
I believe the answer is:
diametric
'completely opposed' is the definition.
(I've seen this before)
'providing aid i e backing for a non-imperial system' is the wordplay.
I cannot really understand how this works, but
an anagram of 'aid' is 'dia' which is located in the answer.
'i' could be 'me' and 'me' is present in the answer.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for diametric that I've seen before include "Completely opposed" , "Absolutely opposed to as matricide" , "opposite" .)