Crossword Genius

Principal role — heavy metal (4)

Ross

I believe the answer is:

lead

This clue is a double definition.

'principal role' is the first definition.
(I've seen this in another clue)

'heavy metal' is the second definition.
(lead is a heavy metal)

(Other definitions for lead that I've seen before include "Travel in front of" , "Take a position in front" , "Main news story" , "Metal -- Pb" , "Guide by going in front" .)

I've seen this clue in The Guardian.
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