A reminder of the injuries concealed by characters in Lewis Carroll (4)

I believe the answer is:

scar

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'a reminder of the injuries concealed' is the definition.
I can't tell whether this definition defines the answer.

'characters in lewis carroll' is the wordplay.
'characters in' indicates a hidden word.
'SCAR' is hidden in the letters of 'lewis carroll'.

'by' is the link.

Can you help me to learn more?

(Other definitions for scar that I've seen before include "Mark left by injury" , "Old-wound mark" , "area of wound" , "Sign of wound" , "Stain" .)

I've seen this clue in the Irish Times.

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