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A sub in form of transport that's dated (8)

Ross

I believe the answer is:

calendar

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'that's dated' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for calendar that I've seen before include "that's dated" , "Year chart" , "Date chart" , "that's stuffed with dates" , "Table of months and days" .)

I've seen this clue in The Sun.
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