What does the cryptic crossword clue "Drain small jug (5)" mean?

The definition is "Drain". The wordplay uses a charade (building blocks). S (synonym of "small") + EWER (synonym of "jug"); definition: "Drain" The answer is Sewer.

Drain small jug (5)

Telegraph #29700 | 21 Down | 2021-06-12 flower

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Times Cryptic #28775 (2023-12-01)