Crossword Genius

Henry punches unattractive clown behind dark bar (5,9)

Ross

I believe the answer is:

plain chocolate

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

'dark bar' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for plain chocolate that I've seen before include "Sweet" , "Dark bar" , "Dark confectionery" .)

I've seen this clue in The Independent.
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