Exposure therapy might treat one (6)

I believe the answer is:

phobia

(Other definitions for phobia that I've seen before include "Extreme and irrational fear" , "15 [EUROPHOBE] 's problem" , "An irrational fear or dislike" , "Pathological fear" , "Obsessive and persistent fear of something" .)

I've seen this clue in the USA Today.

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