21 across
Stamp
grain
product
with
date
(5)
Stamp grain product with date (5)
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The definition is at the beginning of the clue.
How the clue works
Right, so Stamp is your definition there — a brand or mark, that sort of stamp. For the wordplay, take BRAN, your grain product, and stick D on the end, the usual short form for date, and that gives you the answer.