Crossword Genius

Extract two unlike derivatives (6,3)

Ross

I believe the answer is:

winkle out

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'extract' is the definition.
(thesaurus)

'two unlike derivatives' is the wordplay.
'two unlike' can be anagrammed to 'WINKLE OUT'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Another definition for winkle out that I've seen is " Extract with some difficulty".)

I've seen this clue in the Sydney Morning Herald.
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