Crossword Genius

Wealth a drunken sot needs for birds (6)

Ross

I believe the answer is:

riches

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'wealth' is the definition.
(I know that wealth can be written as riches)

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

Can you help me to learn more?

(Other definitions for riches that I've seen before include "Abundance of material possessions and resources" , "lot of lolly" , "Great wealth" , "Lots of money and expensive things" , "Material wealth" .)

I've seen this clue in the Evening Standard.
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