Crossword Genius

Each new motorway starts near Sutton! (5)

Ross

I believe the answer is:

cheam

I'm a little stuck... Click here to teach me more about this clue!

'near sutton' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'each new motorway starts' is the wordplay.
'new' indicates an anagram.
'starts' says to take the initial letters.
The first letter of 'motorway' is 'm'.
'each' is an anagram of 'chea'.
'chea'+'m'='CHEAM'

Can you help me to learn more?

(Another definition for cheam that I've seen is " London suburb".)

I've seen this clue in the Evening Standard.
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