Crossword Genius

Stray from the subject of scandal involving Mariah Carey? (8)

Ross

I believe the answer is:

divagate

'stray from the subject' is the definition.

I cannot understand how the rest of the clue works.

(Other definitions for divagate that I've seen before include "Stray, digress" , "Go off course" .)

I've seen this clue in The Independent.
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