Crossword Genius

When a car crashes, it’s bent (3)

Ross

I believe the answer is:

arc

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

'bent' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'when a car crashes' is the wordplay.
'car' can be anagrammed to 'ARC'.
However, I am not sure how this is indicated.

'it's' is the link.

Can you help me to learn more?

(Other definitions for arc that I've seen before include "Light" , "Luminous electrical discharge" , "Bend" , "bends?" , "section of Circle Line" .)

I've seen this clue in the Evening Standard.
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