Confine confusion in magic diagram (9)

I believe the answer is:

pentangle

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'magic diagram' is the definition.
The definition suggests a singular noun which matches the answer.

'confine confusion' is the wordplay.
'confine' becomes 'pen' (I've seen this in another clue).
'confusion' becomes 'tangle' (tangle is a kind of confusion).
'pen'+'tangle'='PENTANGLE'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for pentangle that I've seen before include "mystic symbol" , "Five-pointed star" , "Pentagram" .)

I've seen this clue in The Times.

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