Soap products (4)

I believe the answer is:

suds

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'soap' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for suds that I've seen before include "Lather" , "Soapy froth" , "Froth made from soap" , "Froth of soap and water" , "Mass of soap bubbles" .)

I've seen this clue in the Evening Standard.

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