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Rarely get comfortable before college function (5)

Ross

I believe the answer is:

cosec

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'function' is the definition.
(mathematical function)

I don't understand how the rest of the clue works.

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

I've seen this clue in The Sunday Times and The Times.
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