Work on the school map somehow: it’s used to examine pupils (14)
I believe the answer is:
ophthalmoscope
'used to examine pupils' is the definition.
I can't tell whether this defines the answer.
'work on the school map somehow' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'somehow' is an anagram indicator.
'the'+'school'+'map'='theschoolmap'
'theschoolmap' is an anagram of 'hthalmoscope'.
'op'+'hthalmoscope'='OPHTHALMOSCOPE'
'it's' is the link.
Can you help me to learn more?
(Other definitions for ophthalmoscope that I've seen before include "Optical instrument" , "Instrument for inspecting the retina and other eye parts" .)