Look for attention in school (6)
I believe the answer is:
search
'look for' is the definition.
('search' can be a synonym of 'look for')
'attention in school' is the wordplay.
'attention' becomes 'ear' (ear is a kind of attention).
'in' is an insertion indicator.
'school' becomes 'sch'.
'ear' going inside 'sch' is 'SEARCH'.
(Other definitions for search that I've seen before include "Fish about" , "Chaser (anag)" , "Go through" , "Look through - arches (anag)" , "Seek (out); hunt (for)" .)