Humble head of faculty punched by yours truly (6)
I believe the answer is:
demean
'humble' is the definition.
(demeaning is a kind of humbling)
'head of faculty punched by yours truly' is the wordplay.
'head of faculty' becomes 'dean' (I've seen this before).
'punched by' is an insertion indicator.
'yours truly' becomes 'me'.
'dean' placed around 'me' is 'DEMEAN'.
(Other definitions for demean that I've seen before include "Degrade, humiliate" , "Lower in reputation or standing" , "Degrade, abase" , "Discredit" , "Cause to lose respect" .)