Might it taste of soap? (4)

I believe the answer is:

cake

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'taste of soap?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for cake that I've seen before include "Compact mass of something" , "Sweet food; become encrusted" , "Eg, gateau" , "Item of food or soap" , "Eg, Battenberg, Genoa" .)

I've seen this clue in the Evening Standard.

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