See Cardiff install mostly new safety measure for pedestrians (7,6)

I believe the answer is:

traffic island

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'safety measure for pedestrians' is the definition.
I can't judge whether this definition defines the answer.

'see cardiff install mostly new' is the wordplay.
'mostly' means to remove the last letter.
'new' indicates anagramming the letters.
'cardiff'+'install'='cardiffinstall'
'cardiffinstall' with its final letter taken away is 'cardiffinstal'.
'cardiffinstal' anagrammed gives 'TRAFFIC ISLAND'.

Can you help me to learn more?

(Other definitions for traffic island that I've seen before include "Refuge for pedestrians" , "Pedestrian refuge" , "Middle-of-the-road haven for pedestrians" , "Raised area in road" , "Concrete 1 across between the lanes?" .)

I've seen this clue in The Telegraph.

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