Crossword Genius

Unlike being fifteen doctor, very strange (9)

Ross

I believe the answer is:

different

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'unlike' is the definition.
(associated in meaning)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for different that I've seen before include "Unusual" , "Otherwise" , "Distinct, separate" , "Dissimilar, unlike" .)

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