Character about to hit road (4)
I believe the answer is:
card
'character' is the definition.
(both can mean a humorous person)
'about to hit road' is the wordplay.
I cannot quite see how this works, but
'about' could be 'ca' (abbreviation for circa) and 'ca' is found in the answer.
'road' could be 'rd' (abbreviation) and 'rd' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for card that I've seen before include "showing heart, say" , "Greetings ----" , "Eccentric - stiff paper" , "king or queen, for example" , "Maybe scratch this" .)