Robin's sash (3)

I believe the answer is:

obi

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'sash' is the definition.
(type of Japanese sash or belt)

'robin's' is the wordplay.
'OBI' is hidden in amongst the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for obi that I've seen before include "__-Wan Kenobi of "Star Wars" - kimono sash" , "Japanese habit?" , "Martial arts sash" , "Charm used in witchcraft" , "exotic waistband" .)

I've seen this clue in The Irish Independent.

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