Scrutinise attention in school (6)

I believe the answer is:

'scrutinise' is the definition.
(thesaurus)

'attention in school' is the wordplay.
'attention' becomes 'ear' (having someone's ear is having their attention).
'in' is an insertion indicator.
'school' becomes 'sch' (abbreviation).
'ear' put within 'sch' is 'SEARCH'.

(Other definitions for search that I've seen before include "thorough examination" , "Look through - arches (anag)" , "Explore" , "Examine (to find something)" , "Pursue a chaser" .)

I've seen this clue in The Times.

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