Rarely get comfortable before college function (5)
I believe the answer is:
cosec
'function' is the definition.
(mathematical function)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(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" .)