Crossword Genius

I stir middle of cup vigorously drinking morning coffee in this? (8)

Ross

I believe the answer is:

tiramisu

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

'coffee in this?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'i stir middle of cup vigorously drinking morning' is the wordplay.
'middle of' says to take the centre.
'vigorously' is an anagram indicator (the letters move vigorously around).
'drinking' is an insertion indicator (inserted letters are consumed or drunk).
'morning' becomes 'am' (as in 12:00 AM).
The centre of 'cup' is 'u'.
'i'+'stir'+'u'='istiru'
'istiru' with letters rearranged gives 'tirisu'.
'tirisu' going around 'am' is 'TIRAMISU'.

Can you help me to learn more?

(Other definitions for tiramisu that I've seen before include "Dessert soaked in alcohol" , "Rich Italian dessert" , "I must air the Italian dessert" , "for which damp sponge is needed" , "It. dessert, literally pick me up" .)

I've seen this clue in The Guardian.
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