Europe can't re-elect centrists... it makes me nuts! (5,4)

I believe the answer is:

pecan tree

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

'it makes me nuts' is the definition.
The definition suggests a singular noun which matches the answer.

'europe can't re-elect centrists' is the wordplay.
'PECAN TREE' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

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

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