Work with the school map, perhaps: it’s for examining pupils (14)
I believe the answer is:
ophthalmoscope
'it's for examining pupils' is the definition.
(an ophthalmoscope is used to examine eyes)
'work with the school map perhaps' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'with' means one lot of letters go next to another.
'perhaps' is an anagram indicator.
'the'+'school'+'map'='theschoolmap'
'theschoolmap' with letters rearranged gives 'hthalmoscope'.
'op'+'hthalmoscope'='OPHTHALMOSCOPE'
(Other definitions for ophthalmoscope that I've seen before include "Instrument for inspecting the retina and other eye parts" , "Optical instrument" .)