Crossword Genius

Unchanged fare tails off for Chinese outfit (6)

Ross

I believe the answer is:

samfoo

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'chinese outfit' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for samfoo that I've seen is " Chinese outfit".)

I've seen this clue in The Times and The Sunday Times.
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