Largely dark and loveless election tragically crossed lines (10)

I believe the answer is:

interlaced

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'largely dark' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

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

Can you help me to learn more?

(Another definition for interlaced that I've seen is " Woven together".)

I've seen this clue in The Independent.

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