Fool to exercise at school? (4)
I believe the answer is:
dope
'fool' is the definition.
(both can mean a stupid person)
'exercise at school?' is the wordplay.
'exercise' becomes 'do' (synonyms).
'at school?' becomes 'pe' (I am not sure about this - if you are sure you should believe this answer much more).
'do'+'pe'='DOPE'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for dope that I've seen before include "Illegal drugs; fool" , "grass, perhaps" , "Information, fool" , "Informal drug or stupid person" , "Drug - information" .)