9 down
Those
with
charts
choose
to
hide
book?
Stirs
trouble
(12)
Those with charts choose to hide book? Stirs trouble (12)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Those with charts is the definition — opticians use those eye charts. Take OPT (choose) wrapped around TOME (book) to get OPTOMET, then tack on an anagram of "stirs" (indicated by trouble) giving RISTS, for OPTOMETRISTS.