Investigation concerning school that's capturing attention (8)
I believe the answer is:
research
'investigation' is the definition.
(research is a kind of investigation)
'concerning school that's capturing attention' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'school' becomes 'sch' (abbreviation).
'that's capturing' indicates putting letters inside.
'attention' becomes 'ear' (having someone's ear is having their attention).
'sch' enclosing 'ear' is 'search'.
're'+'search'='RESEARCH'
(Other definitions for research that I've seen before include "material for investigation" , "scientific survey" , "Systematic investigation to establish facts" , "Scientific study" , "Experimentation" .)