Arriving at principal's office, reaching crisis (6,2,1,4)
I believe the answer is:
coming to a head
'office reaching crisis' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'arriving at principal's' is the wordplay.
I cannot quite understand how this works, but
'arriving' could be 'coming' (coming is a kind of arriving) and 'coming' is found within the answer.
'principal' could be 'head' (synonyms) and 'head' is present in the answer.
The remaining letters 'toa' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for coming to a head that I've seen is " Reaching a crisis".)