Extremely bad candle will be (6)

I believe the answer is:

wicked

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'extremely bad' is the definition.
'wicked' can be an answer for 'bad' (similar in meaning). I'm unsure of the 'extremely' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for wicked that I've seen before include "Evil or morally wrong" , "show" , "Sinful" , "Ungodly; excellent (sl.)" , "Morally bad or wrong" .)

I've seen this clue in The Sun.

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