Some part cue left back where Cleombrotus went out (7)

I believe the answer is:

leuctra

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'where cleombrotus went out' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'some part cue left back' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'back' says the letters should be written in reverse.
'artcuel' can be found hidden inside 'part cue left'.
'artcuel' backwards is 'LEUCTRA'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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