Crossword Genius

Key of D sounding top-class (6)

Ross

I believe the answer is:

delete

'key' is the definition.
(key on a computer keyboard)

I don't understand the remainder of the clue.

(Other definitions for delete that I've seen before include "Remove, cross out" , "Obliterate" , "Get rid of" , "Remove or erase (text)" , "Eras" .)

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