Very good? Very bad! (6)

I believe the answer is:

wicked

I believe this is a double definition.

'very good?' is the first definition.
(slang term)

'very bad' is the second definition.

(Other definitions for wicked that I've seen before include "show" , "Very bad, or very good nowadays" , "[SMASHING, COOL, DANDY]" , "Morally bad or wrong" , "very likely to cause harm" .)

I've seen this clue in The Sun.

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