Crossword Genius

Ted's interchange is most fashionable (9)

Ross

I believe the answer is:

trendiest

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'is most fashionable' is the definition.
('trendy' can be similar in meaning to 'fashionable')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for trendiest that I've seen before include "Most cool!" , "Most popular" , "cooler than the rest" .)

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