11 across
Complaint
from
one
head
about
pupils
(7)
Complaint from one head about pupils (7)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition here is Complaint, referring to a sickness. You take I for "one", then NESS (a headland, so "head") wrapped around LL (two L-plates, meaning "pupils"), and that gives you the full answer.