Crossword Genius

Sack and what may be put in it (7)

Ross

I believe the answer is:

plunder

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

'sack' is the definition.
(I know that plunder is a type of sack)

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

Can you help me to learn more?

(Other definitions for plunder that I've seen before include "Loot" , "Stolen or looted goods" , "Sack - or what might be put in one!" , "Goods taken" , "Rob" .)

I've seen this clue in The Sun and The Globe and Mail.
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