Her auto's a bit old (5)

I believe the answer is:

carol

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'her' is the definition.
(woman's name)

'auto's a bit old' is the wordplay.
'auto' becomes 'car' (synonyms).
'a bit' becomes 'o' (resembles 0, a binary digit or bit).
'old' becomes 'l' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'car'+'o'+'l'='CAROL'

Can you help me to learn more?

(Other definitions for carol that I've seen before include "Song celebrating the birth of Jesus" , "Song, especially at Christmas" , "and 27: Waits" , "Girl" , "See 1" .)

I've seen this clue in the Evening Standard.

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