Part you see in Hero and Leander’s union? (4)

I believe the answer is:

role

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'part' is the definition.
(eg a theatrical role)

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

(Other definitions for role that I've seen before include "Playing part" , "Function in life" , "Duty" , "Part (in drama)" , "A part of lore" .)

I've seen this clue in The Times.

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