Mark, intimidated by Edward? (4)

I believe the answer is:

scar

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

Here is my best explanation:

This clue could be a double definition.

'mark' is the first definition.
(synonyms)

'intimidated by edward?' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?