No rock cake, but it suggests a stone (5)
I believe the answer is:
'no rock cake' is the definition.
'scone' can be an answer for 'cake' (I know that scone is a type of cake). I am not sure about the 'no rock' bit.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for scone that I've seen before include "Griddle-cake" , "Cream tea cake" , "baked cake" , "Product of baker" , "Savoury cake" .)