Crossword Genius

Oppose unorthodox sister (6)

Ross

I believe the answer is:

resist

'oppose' is the definition.
(resisting is a kind of opposing)

'unorthodox sister' is the wordplay.
'unorthodox' indicates an anagram.
'sister' with letters rearranged gives 'RESIST'.

(Other definitions for resist that I've seen before include "Defy for sister" , "Offer opposition to" , "Forgo" , "Don't give in" , "Put up opposition to sister" .)

I've seen this clue in The Telegraph.
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