Crossword Genius

Corporation starts to unpack loads involving barrows (6)

Ross

I believe the answer is:

tumuli

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tumuli that I've seen before include "several burial places" , "Ancient burial mounds" , "Barrows" .)

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