Crossword Genius

Commercial for cake? (4)

Ross

I believe the answer is:

soap

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'commercial' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'cake?' is the second definition.
(I've seen this before)

'for' acts as a link.

Can you help me to learn more?

(Other definitions for soap that I've seen before include "TV programme - sudsy bar" , "Washing aid" , "Coronation Street?" , "Sudsy TV show?" , "Serialised drama" .)

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