No rock cake, but it may suggest stone (5)

I believe the answer is:

scone

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

'no rock cake' is the definition.
'scone' can be an answer for 'cake' (scone is a type of cake). I'm not sure about the 'no rock' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for scone that I've seen before include "A little cake" , "Plain cake (for Scottish kings?)" , "baked cake" , "Plain teatime cake" , "in which a stone was once found?" .)

I've seen this clue in the Evening Standard.

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