Crossword Genius

Label oddly lacking on unopened aromatic compound jars (8)

Ross

I believe the answer is:

amphorae

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'jars' 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 amphorae that I've seen before include "Tall classical jars (E, not S)" , "ancient vessels" .)

I've seen this clue in The Hindu.
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