Crossword Genius

Bad marks for being crass? (5)

Ross

I believe the answer is:

scars

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

'bad marks' is the definition.
The definition and answer can be both to do with contact as well as being verbs in their -s form.
I also know that 'marks' relates to this answer.

'being crass?' is the wordplay.
'crass' can be anagrammed to 'SCARS'.
Though, I am not clear how this is indicated.

'for' is the link.

Can you help me to learn more?

(Another definition for scars that I've seen is " Marks left by wounds".)

I've seen this clue in the Evening Standard.
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