What does the cryptic crossword clue "Restrict river level (4)" mean?

The definition is "level". The wordplay uses a charade (building blocks). TIE (synonym of "Restrict") + R (synonym of "river"); definition: "level" The answer is TIER.

Restrict river level (4)

Guardian Cryptic #24542 | 10 Across | 2008-11-10 flower

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