Crossword Genius

Bad side dominated by Millwall initially (6)

Ross

I believe the answer is:

malign

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'bad' 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 malign that I've seen before include "Speak ill of; evil" , "Defame, vilify" , "Wicked, evil" , "Bad-mouth" , "Evil, baleful" .)

I've seen this clue in The Sunday Times.
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