Crossword Genius

Doughnut - foremost refreshment in tourist city - is too sweet (8)

Ross

I believe the answer is:

overnice

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

'doughnut foremost refreshment in tourist city' is the definition.
I can't tell whether this definition defines the answer.

'too sweet' is the wordplay.
'too' becomes 'over' (I can't justify this - if you can you should give a lot more credence to this answer).
'sweet' becomes 'nice' (I've seen this in another clue).
'over'+'nice'='OVERNICE'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for overnice that I've seen before include "Too fastidious" , "too chocolate-boxy" , "Too difficult" , "Excessively fussy" .)

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