Crossword Genius

Notice in park or rehab centre? (4,3,3,5)

Ross

I believe the answer is:

keep off the grass

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If this is the answer I cannot explain how the clue works.

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(Other definitions for keep off the grass that I've seen before include "No drugs" , "DD Don't Smoke Cannabis" , "Sign on lawn" , "Don't reach the green" , "sign - one seen in park?" .)

I've seen this clue in The Hindu.
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