Happiest time for those not attending night classes? (10)
I believe the answer is:
schooldays
'those not attending night classes?' is the definition.
I can't judge whether this defines the answer.
'happiest time' is the wordplay.
'happiest' becomes 'school' (I am not sure about this - if you are sure you should believe this answer much more).
'time' becomes 'days' (day is a unit of time).
'school'+'days'='SCHOOLDAYS'
'for' is the link.
Can you help me to learn more?
(Other definitions for schooldays that I've seen before include "Happiest days of your life?" , "Choosy lads (anag) -- life's learning time?" .)