Crossword Genius

Just desserts of rap, pessimistically? (7)

Ross

I believe the answer is:

frappes

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

'just desserts' is the definition.
'frappes' can be an answer for 'desserts' (frappe is a kind of dessert). I'm not sure about the 'just' bit.

'of rap pessimistically?' is the wordplay.
'FRAPPES' is hidden within the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

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