Fundraising target, often (4)
I believe the answer is:
alum
(Other definitions for alum that I've seen before include "Sulphate used in dyeing and tanning" , "Compound used in tanning and dying" , "Name given to a specific chemical compound and a class of them" , "Sulphate; maul (anag.)" , "White mineral salt used in medicine and in dyeing" .)