Crossword Genius

What the tabloids call Boris Johnson when Germany replaces British combat training site (4)

Ross

I believe the answer is:

dojo

'combat training site' is the definition.
(room for martial arts)

I don't understand how the remainder of the clue works.

(Other definitions for dojo that I've seen before include "Combat centre" , "place of karate" .)

I've seen this clue in The Guardian.
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