Quiet time for many students around university (4)
I believe the answer is:
lull
'quiet time' is the definition.
(I've seen this in another clue)
'many students around university' is the wordplay.
'many' becomes 'l' ().
'students' becomes 'LL' (two abbreviations for learner).
'around' indicates putting letters inside.
'university' becomes 'U' (abbreviation for university).
'l'+'ll'='lll'
'lll' enclosing 'u' is 'LULL'.
'for' is the link.
(Other definitions for lull that I've seen before include "A quiet spell as in a storm" , "Hiatus or respite" , "Calm interval in storm" , "Soothe; quiet interval" , "Pause in activity" .)