Students acted crazily on Sunday (6)
I believe the answer is:
cadets
'students' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps you can see an association between them that I don't see?
'acted crazily on sunday' is the wordplay.
'crazily' indicates anagramming the letters.
'on' says to put letters next to each other.
'sunday' becomes 's'.
'acted' is an anagram of 'cadet'.
'cadet'+'s'='CADETS'
Can you help me to learn more?
(Other definitions for cadets that I've seen before include "Officers potentially" , "Trainee army officers" , "Casted as young army men" , "Military trainees" , "Army officer trainees" .)