College mag recipient (4)
I believe the answer is:
alum
'college mag recipient' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alum that I've seen before include "Aluminium/potassium sulphate" , "double sulphate" , "Colourless compound used in dyeing and tanning" , "Potassium compound; IoW sandy bay" , "Sulphate; maul (anag.)" .)