Advisers are not the same as opponents (11)

I believe the answer is:

adversaries

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'opponents' is the definition.
('adversary' can be a synonym of 'opponent')

'advisers are not the same' is the wordplay.
'advisers are' anagrams to 'ADVERSARIES'.
However, I am not sure how the anagram is indicated.

'as' is the link.

Can you help me to learn more?

(Another definition for adversaries that I've seen is " Enemies".)

I've seen this clue in The Globe and Mail.

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