What's behind member's temper in EU? Money, partly (8)

I believe the answer is:

perineum

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'what's behind member's' is the definition.
I can't tell whether this defines the answer.

'temper in eu? money partly' is the wordplay.
'partly' says the answer is hidden in the clue (part of the clue is used).
'PERINEUM' can be found hidden inside 'temper in eu money'.

Can you help me to learn more?

I've seen this clue in The Independent.

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