Cars can turn round in them (4)

I believe the answer is:

arcs

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'turn round in them' is the definition.
I can't tell whether this defines the answer.

'cars can' is the wordplay.
'can' is an anagram indicator (I've seen 'canned' mean this (canned can mean drunk)).
'cars' with letters rearranged gives 'ARCS'.

Can you help me to learn more?

(Other definitions for arcs that I've seen before include "Curving trajectories" , "Parts of a circle" , "Cars (anag)" , "Curves in cars" , "Streaks of electrical discharges" .)

I've seen this clue in the Evening Standard.

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