Crossword Genius

Container of rainwater maybe, about a half gallon (6)

Ross

I believe the answer is:

wallet

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'container' is the definition.
(wallet is a kind of container)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for wallet that I've seen before include "A man's pocket-book" , "Pocket-sized money case" , "Folding case for money" , "Small case for paper money" , "A man's pocketbpook" .)

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