Crossword Genius

Happiest time for those not attending night classes? (10)

Ross

I believe the answer is:

schooldays

I'm a little stuck... Click here to teach me more about this clue!

'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?" .)

I've seen this clue in The Guardian and The Globe and Mail.
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