Attired with a vinaigrette, say (7)

I believe the answer is:

dressed

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'attired' is the definition.
(I know that attired can be written as dressed)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for dressed that I've seen before include "bandaged" , "Trimmed" , "Applied manure to garden" , "Arranged" , "Up and ready to go" .)

I've seen this clue in The Daily Express.

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