Even for the middleman keeping a level head is the best option (5)

I believe the answer is:

ideal

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'best option' is the definition.
'ideal' can be an answer for 'best' (I've seen this in another clue). I'm not certain of the 'option' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ideal that I've seen before include "Just the ticket" , "fanciful" , "existing only in imagination" , "Nonpareil" , "principle to be aimed at" .)

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

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