Car chart that’s personally signed (9)
I believe the answer is:
autograph
'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" .)