Crossword Genius

Sweet enough to relieve Bach of his backache. (4)

Ross

I believe the answer is:

cake

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

'sweet' is the definition.
(I know that cake is a type of sweet)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for cake that I've seen before include "Sweet food; become encrusted" , "It might have layers" , "Mixture of flour, sugar, eggs and fat" , "Item of food or soap" , "Set" .)

I've seen this clue in The Irish Times.
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