Sweet dance one studied (3,4)

I believe the answer is:

rum baba

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'sweet' is the definition.
(I've seen this before)

'dance one studied' is the wordplay.
'dance' becomes 'rumba' (rumba is a type of dance).
'one studied' becomes 'ba' (I can't explain this - if you can you should give a lot more credence to this answer).
'rumba'+'ba'='RUM BABA'

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(Other definitions for rum baba that I've seen before include "Spirited item at tea" , "Alcoholic cake" , "Soaked sponge dessert" , "Spirit-soaked cake" , "Rich cake" .)

I've seen this clue in The Telegraph.

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