Crossword Genius

Nameless constable demolished barrier (8)

Ross

I believe the answer is:

obstacle

'barrier' is the definition.
(I've seen this before)

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

(Other definitions for obstacle that I've seen before include "bar" , "race" , "Maybe let" , "Thing that obstructs progress" , "Anything that stands in the way" .)

I've seen this clue in The Guardian.
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