What does the cryptic crossword clue "Railway not smooth enough? (11)" mean?

The definition is "Railway". The wordplay uses a charade (building blocks). UNDER (synonym="UNDER") + GROUND (synonym="GROUND") = UNDERGROUND; definition: "Railway" The answer is UNDERGROUND.

Railway not smooth enough? (11)

Times Cryptic #28601 | 7 Down | 2023-05-12 flower

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