Crossword Genius

For a good time, can it exist a negative way? (5)

Ross

I believe the answer is:

beano

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

'for a good time can it' is the definition.
I can't judge whether this definition defines the answer.

'exist a negative way?' is the wordplay.
'exist' becomes 'be' (synonyms).
'negative way?' becomes 'no' (I can't explain this - if you can you should believe this answer much more).
'be'+'a'+'no'='BEANO'

Can you help me to learn more?

(Other definitions for beano that I've seen before include "Rowdy jollification" , "Kids' comic" , "Comic - party" , "Comic and informal get-together" , "Enjoyable party" .)

I've seen this clue in the Evening Standard.
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