Crossword Genius

Reciprocal of sine (5)

Ross

I believe the answer is:

cosec

(Other definitions for cosec that I've seen before include "company secretary" , "(In mathematics) the reciprocal of sine (abbr)" , "Inverse of sine (abbr.)" , "(In maths) reciprocal of sine (abbr)" , "Trig function" .)

I've seen this clue in The Times.
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