Mark Wahlberg's focus returns on film - ultimately melting hearts (7)

I believe the answer is:

blemish

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

'mark' is the definition.
(I know that blemish is a is a more specific form of the action of mark)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for blemish that I've seen before include "Moral defect or fault" , "Disfigurement" , "Flaw; moral defect" , "bad mark?" , "deformity" .)

I've seen this clue in The Guardian.

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