Filled one's sack going round university (6)
I believe the answer is:
imbued
'filled' is the definition.
(similar in meaning)
'one's sack going round university' is the wordplay.
'one's' becomes 'I'm' ('one is' is a formal way of saying 'I am').
'sack' becomes 'bed' ('in the sack' means 'in bed').
'going round' means one lot of letters goes inside another (some letters go around others).
'university' becomes 'u' (abbreviation for university).
'bed' enclosing 'u' is 'bued'.
'im'+'bued'='IMBUED'
(Other definitions for imbued that I've seen before include "Filled, with ideals say" , "Filled with certain feelings or opinions" , "Soaked, saturated" , "Filled person with certain feelings" , "Permeated (with)" .)