Crossword Genius

They're often found in a lather (4)

Ross

I believe the answer is:

suds

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'lather' is the definition.
(I know that lather can be written as suds)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for suds that I've seen before include "Soap bubbles; scum" , "Froth of soap and water" , "Soapy water" , "Lather" , "Foam from detergent" .)

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