Damage flesh with knife? (4-4)

I believe the answer is:

self-harm

'damage flesh with knife?' is the definition.
I can't judge whether this definition defines the answer.

'damage flesh with knife?' is the wordplay.
'damage' indicates an anagram (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'knife?' becomes 'arm' (knife is an example).
'flesh' is an anagram of 'selfh'.
'selfh'+'arm'='SELF-HARM'

I've seen this clue in The Guardian.

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