Crossword Genius

Gateway grating (10)

Ross

I believe the answer is:

portcullis

(Other definitions for portcullis that I've seen before include "Grating at castle entrance" , "entry may be barred by this" , "iron grating" , "Grating that can be lowered to seal gateway (of castle)" , "Castle gate" .)

I've seen this clue in The Telegraph and the Sydney Morning Herald.
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