Fitness expert rare commodity in Middle East? (5)

I believe the answer is:

peace

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

'rare commodity in middle east?' is the definition.
I can't judge whether this defines the answer.

'fitness expert' is the wordplay.
'fitness' becomes 'PE' (physical education).
'expert' becomes 'ace' (ace can informally mean very good).
'pe'+'ace'='PEACE'

Can you help me to learn more?

(Other definitions for peace that I've seen before include "Freedom from disturbance, tranquillity" , "[STILLNESS]" , "still?" , "State of freedom from war" , "Caught" .)

I've seen this clue in The Times.

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