Crossword Genius

Car chart that’s personally signed (9)

Ross

I believe the answer is:

autograph

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

'that's personally signed' is the definition.
I can't judge whether this defines the answer.

'car chart' is the wordplay.
'car' becomes 'auto' (synonyms).
'chart' becomes 'graph' (I've seen this before).
'auto'+'graph'='AUTOGRAPH'

Can you help me to learn more?

(Other definitions for autograph that I've seen before include "A signature given as souvenir" , "Sign" , "a collector's item perhaps" , "Handwriting" , "Signer will give this" .)

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