Where boys were collared to go to school (4)
I believe the answer is:
eton
'to school' is the definition.
(famous UK public school)
'where boys were collared to go' is the wordplay.
I cannot quite understand how this works, but
'to' is present in the answer.
The remaining letters 'en' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for eton that I've seen before include "College, collar or crop" , "Berkshire public school" , "Note sent up to English public school" , "College in Berkshire" , "Berkshire town" .)