Is this your crossword clue?
"blocks" is also used as a crossword clue. If that's what you saw, the answer is often obstructing (11 letters).
Definitions
Solid pieces, city sections, or things that stop progress.
Used as a crossword answer2 curated clues
01“City sections”6 letters
02“Solid pieces or obstructs”6 letters
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B_____