Morbid fear (6)
'morbid fear' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for phobia that I've seen before include "Obsessive and persistent fear of something" , "15 [EUROPHOBE] 's problem" , "A lasting abnormal fear of smoething" , "Abnormal lasting fear or anxiety" , "Irrational fear (of thing)" .)
(Other definitions for dread that I've seen before include "Anticipate with fear" , "Apprehensive fear" , "Terror" , "Be scared of" , "Anticipate fearfully" .)