Part of the address given by principal (4)
I believe the answer is:
head
'principal' is the definition.
(I know that head is a type of principal)
'part of the address given' is the wordplay.
'part of' indicates a hidden word.
'HEAD' can be found hidden inside 'the address given'.
'by' acts as a link.
(Other definitions for head that I've seen before include "School boss" , "Be in charge of; (come to) crisis" , "Cranium" , "River source; promontory" , "Chief; promontory" .)