Crossword Genius

Jersey postal system collection (7)

Ross

I believe the answer is:

maillot

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for maillot that I've seen before include "Tights worn for ballet" , "Swimsuit" , "Top" , "Jersey" .)

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