Find real chaos at the detention centre (5)
I believe the answer is:
learn
'find' is the definition.
(I've seen this before)
'real chaos at the detention centre' is the wordplay.
'chaos' indicates an anagram.
'at' says to put letters next to each other.
'centre' says to take the centre.
The middle letter of 'detention' is 'n'.
'real' with letters rearranged gives 'lear'.
'lear'+'n'='LEARN'
(Other definitions for learn that I've seen before include "Study - find out" , "Succeed in school" , "Study (at school?)" , "Master" , "Con" .)