Leave me alone, teacher foolishly bids tutor (2,3,7)
I believe the answer is:
do not disturb
'leave me alone' is the definition.
(instruction to leave someone alone)
'teacher foolishly bids tutor' is the wordplay.
'teacher' becomes 'don' (don is a kind of teacher).
'foolishly' is an anagram indicator.
'bids'+'tutor'='bidstutor'
'bidstutor' is an anagram of 'otdisturb'.
'don'+'otdisturb'='DO NOT DISTURB'
(Other definitions for do not disturb that I've seen before include "Instruction on a hotel bedroom door?" , "Don't clean our hotel room now!" .)