Too nice to be tatty, exactly? (5)

I believe the answer is:

tasty

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

'too nice' is the definition.
'tasty' can be an answer for 'nice' (thesaurus). I am not sure about the 'too' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tasty that I've seen before include "Palatable" , "Pleasantly flavoursome" , "Pleasant to savour" , "Pleasantly flavoured" , "Like nice grub" .)

I've seen this clue in the Evening Standard.

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