Crime — so it could turn into sexual excitement? (9)

I believe the answer is:

eroticism

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

'sexual excitement?' is the definition.
The definition and answer can be both feelings as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'crime so it could turn' is the wordplay.
'crime so it' anagrams to 'EROTICISM'.
However, I'm not clear how this is indicated.

'into' is the link.

Can you help me to learn more?

(Another definition for eroticism that I've seen is " Amorous temperament".)

I've seen this clue in The Guardian.

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