Anxiety disorder, a fear of open spaces, named by Karl Westphal in 1871 (11)

I believe the answer is:

agoraphobia

(Other definitions for agoraphobia that I've seen before include "Fear of outdoors" , "Morbid fear of open spaces" , "Fear of being in public places" , "Morbid fear of open places" .)

I've seen this clue in The Mirror.

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