"Chain Reaction" singer, 1985 (4)

I believe the answer is:

ross

(Other definitions for ross that I've seen before include "US singer Diana" , "-- And Cromarty, former county of Scotland" , "-- Dependency; -- Sea" , "Wye town; Antarctic sea" , "Macbeth nobleman; Antarctic sea" .)

I've seen this clue in The New York Times.

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