Sash 50% too big (3)

I believe the answer is:

obi

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

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

'50% too big' is the wordplay.
'OBI' is hidden in amongst the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for obi that I've seen before include "Form of witchcraft" , "__-Wan Kenobi of "Star Wars" - kimono sash" , "Japanese dress" , "Caribbean's charming" , "Japanese sash - African witchcraft" .)

I've seen this clue in The Globe and Mail and The Guardian.

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