Crossword Genius

Communicate what errors do? (3,6)

Ross

I believe the answer is:

get across

'communicate' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

(Other definitions for get across that I've seen before include "Clearly explain" , "Go over - explain" , "Express" , "what crucifer must do first of all" , "go over viaduct, say" .)

I've seen this clue in The Times.
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