Crossword Genius

US singer's instruction to peers before procession? (7)

Ross

I believe the answer is:

robeson

'us singer's' is the definition.
(Paul Robeson)

I cannot understand how the rest of the clue works.

(Other definitions for robeson that I've seen before include "Paul -. US bass singer and actor" , "Paul ......., great American bass singer and actor (" .)

I've seen this clue in The Guardian.
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