Crossword Genius

A better type of cake (5)

Ross

I believe the answer is:

layer

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

'type of cake' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for layer that I've seen before include "Coating" , "Source of eggs" , "Single thickness, tier" , "One supplying eggs" , "Stratum, tier" .)

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