Crossword Genius

Cake used pith (5)

Ross

I believe the answer is:

scone

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

This clue might be a double definition.

'cake' is the first definition.
(scone is a type of cake)

'pith' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'used' is the link.

Can you help me to learn more?

(Other definitions for scone that I've seen before include "Small plain cake and Scottish town" , "Cream tea cake" , "Plain cake (for Scottish kings?)" , "baked cake" , "Accompaniment for tea" .)

I've seen this clue in the Sydney Morning Herald.
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