Fall back on Middle Eastern mutualities (6)

I believe the answer is:

autumn

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

'fall' is the definition.
(I know that fall can be written as autumn)

'back on middle eastern mutualities' is the wordplay.
'AUTUMN' is hidden back-to-front in amongst the letters.
But, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for autumn that I've seen before include "Americans call it the fall" , "1 Season of mists and mellow fruitfulness" , "part of year?" , "Season of mists and mellow fruitfulness, according to Keats" , "Fall in North America" .)

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

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