Crossword Genius

Barrier (5)

Ross

'barrier' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for block that I've seen before include "City area; prevent flow" , "Cube" , "Solid shape; prevent" , "building development" , "Obstruct" .)

I've seen this clue in The Telegraph, the Penny Press and the Evening Standard.
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