Unusual crime scene — PC out to get subject (8,7)

I believe the answer is:

computer science

'subject' is the definition.
(computer science is a kind of subject)

'unusual crime scene pc out' is the wordplay.
'unusual' indicates an anagram.
'crime'+'scene'+'pc'+'out'='crimescenepcout'
'crimescenepcout' is an anagram of 'COMPUTER SCIENCE'.

'to get' acts as a link.

I've seen this clue in The Guardian.

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