Crossword Genius

A friend who'll wash up? (3)

Ross

I believe the answer is:

pal

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'a friend' is the definition.
(I know that pal is a type of friend)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pal that I've seen before include "Bud" , "Brother" , "Buddy, chum" , "China" , "Mate, buddy" .)

I've seen this clue in the Evening Standard.
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