Praise a very quiet lad welcoming university (7)
I believe the answer is:
applaud
'praise' is the definition.
(I've seen this before)
'a very quiet lad welcoming university' is the wordplay.
'very quiet' becomes 'pp'.
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'university' becomes 'u'.
'lad' enclosing 'u' is 'laud'.
'a'+'pp'+'laud'='APPLAUD'
(Other definitions for applaud that I've seen before include "Cheer" , "Express approbation" , "Approve with clapping" , "Show appreciation towards" , "Give an ovation" .)