What does the cryptic crossword clue "Some trouble – but only some – for transport system (5)" mean?

The definition is "transport system". The wordplay uses a container (one word inside another). Hidden in "soME TROuble – but only some – for transport system" The answer is METRO.

Some trouble – but only some – for transport system (5)

Guardian Cryptic #29214 | 20 Across | 2023-10-30 flower

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