Crossword Genius

Broad sash initially introduced by former pupil (3)

Ross

I believe the answer is:

obi

'broad sash' is the definition.
(I've seen this before)

'initially introduced by former pupil' is the wordplay.
'introduced' indicates taking the first letters.
'by' is a charade indicator (letters next to each other).
'former pupil' becomes 'OB' (abbreviation for 'Old Boy' - private school pupil).
The initial letter of 'initially' is 'i'.
'i' put after 'ob' is 'OBI'.

(Other definitions for obi that I've seen before include "Broad Japanese sash" , "Material band" , "exotic waistband" , "Garment" , "Spells" .)

I've seen this clue in The Times.
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