Crossword Genius

Important, seemingly heavy role (4)

Ross

I believe the answer is:

lead

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'role' is the definition.
(thesaurus)

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

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(Other definitions for lead that I've seen before include "Metal - wire" , "Leash -- Pb" , "Command; metal" , "Be ahead of - guide" , "Guide; metallic element" .)

I've seen this clue in the Evening Standard.
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