Crossword Genius

Police on radio evacuated transit network (5)

Ross

I believe the answer is:

metro

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'transit network' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'police on radio evacuated' is the wordplay.
'police' becomes 'met' (London Metropolitan Police).
'on' is a charade indicator (letters next to each other).
'evacuated' means to remove the middle letters (internal letters are evacuated from the word).
'radio' with its centre removed is 'ro'.
'met'+'ro'='METRO'

Can you help me to learn more?

(Other definitions for metro that I've seen before include "French underground" , "Parisian underground railway" , "what moves many Parisians" , "The underground railway system in Paris" , "Parisian underground system" .)

I've seen this clue in The Times.
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