Mixed-sex code-cracking (2-2)

I believe the answer is:

co-ed

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'mixed-sex' is the definition.
I can't judge whether this definition defines the answer.

'code-cracking' is the wordplay.
'cracking' indicates anagramming the letters.
'code' with letters rearranged gives 'CO-ED'.

Can you help me to learn more?

(Other definitions for co-ed that I've seen before include "School for boys and girls, in short" , "Teaching both girls and boys" , "School for both sexes" , "Teaching attended by both sexes" .)

I've seen this clue in The Mirror.

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