Crossword Genius

Politician: choice of extremes for Trotsky? (4)

Ross

I believe the answer is:

tory

I'm a little stuck... Click here to teach me more about this clue!

'politician' is the definition.
(I've seen this before)

'choice of extremes for trotsky?' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'try' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for tory that I've seen before include "type on right? Yes" , "Traditionalist" , "Opponent of 8 Down and 14 Across, partner of 14 Down?" , "blue" , "English Conservative politician or Donegal island" .)

I've seen this clue in The Telegraph.
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