Be passionate about teacher's initial suggestion for sacrifice (5,8)
I believe the answer is:
burnt offering
'sacrifice' is the definition.
(thesaurus)
'be passionate about teacher's initial suggestion' is the wordplay.
'be passionate about' becomes 'burn'.
'initial' indicates taking the first letters.
'suggestion' becomes 'offering'.
The initial letter of 'teachers' is 't'.
'burn'+'t'+'offering'='BURNT OFFERING'
'for' is the link.
(Other definitions for burnt offering that I've seen before include "made by harassed cook?" , "Ritual sacrifice - ruined dinner?" , "Sacrificial atonement (for an overcooked meal?)" , "inedible fare" , "Sacrificial object" .)