Recurring phrase upset almost two-thirds of Ottomans (5)

I believe the answer is:

motto

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'recurring phrase' is the definition.
(I've seen this before)

'upset almost two-thirds of ottomans' is the wordplay.
'MOTTO' is hidden back-to-front in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for motto that I've seen before include "Phrase to express character" , "Favourite saying of a group" , "Recurring musical phrase" , "Maxim; slogan" , "Catchcry, slogan" .)

I've seen this clue in The Telegraph.

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