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Dogs are, we hear, wearing formal evening attire (6)

Ross

I believe the answer is:

trails

I'm a little stuck... Click here to teach me more about this clue!

'dogs' is the definition.
('trail' can be a synonym of 'dog')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for trails that I've seen before include "Follows - footpaths in the wild" , "Paths or tracks through wild or hilly country" , "Follows or drags behind" , "Goes after" , "Paths through, say, a forest" .)

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