Crossword Genius

...in roof angle (3)

Ross

I believe the answer is:

hip

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This might be a double definition.

'in' is the first definition.
(both can mean fashionable)

'roof angle' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for hip that I've seen before include "Trendy bodily joint?" , "Fruit of the wild rose (3)" , "Side of body - very sophisticated" , "Cool < fruit" , "In slang, trendy or stylish like body joint" .)

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