Milk supplier in western university sacked (3,5)
I believe the answer is:
wet nurse
'milk supplier' is the definition.
(I've seen this before)
'western university sacked' is the wordplay.
'university' becomes 'U' (abbreviation for university).
'sacked' indicates an anagram (sack can mean to plunder or destroy).
'western'+'u'='westernu'
'westernu' is an anagram of 'WET-NURSE'.
'in' acts as a link.
(Other definitions for wet nurse that I've seen before include "Milk supplier" , "feeder" , "Woman feeding another's baby" , "Coddle" , "Woman to help mum" .)