Crossword Genius

Determined not to be given as an opponent (3,7)

Ross

I believe the answer is:

set against

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'be given as an opponent' is the definition.
I can't judge whether this defines the answer.

'determined not' is the wordplay.
'determined' becomes 'set' (similar in meaning).
'not' becomes 'against' (I can't explain this - if you can you should give a lot more credence to this answer).
'set'+'against'='SET AGAINST'

'to' is the link.

Can you help me to learn more?

(Another definition for set against that I've seen is " Assail; compare, balance".)

I've seen this clue in the Evening Standard.
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