Allowed out of school, etc. (3)
I believe the answer is:
let
'allowed' is the definition.
(to let is to allow or permit)
'of school etc' is the wordplay.
'of' indicates a hidden word.
'LET' can be found hidden inside 'school etc'.
'out' acts as a link.
(Other definitions for let that I've seen before include "Was inclined to ignore" , "Rent out (property)" , "Allow; rental period" , "Service that must be repeated" , "Won't stop you" .)