Rearranged oral inspection looking after children (2,4,8)
I believe the answer is:
in loco parentis
'looking after children' is the definition.
(Latin term meaning acting in place of parents)
'rearranged oral inspection' is the wordplay.
'rearranged' indicates anagramming the letters.
'oral'+'inspection'='oralinspection'
'oralinspection' anagrammed gives 'IN LOCO PARENTIS'.
(Other definitions for in loco parentis that I've seen before include "Looking after wards, perhaps" , "Trying to be mum" , "old man?" , "As a teacher may be" , "looking after children away from home?" .)