Police on radio evacuated transit network (5)
I believe the answer is:
metro
'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" .)