Fear of Asian soup mostly prejudice (6)
I believe the answer is:
phobia
'fear' is the definition.
(a phobia is a fear of a particular thing)
'asian soup mostly prejudice' is the wordplay.
'asian soup' becomes 'pho' (type of Vietnamese soup. I am not sure about the 'asian' bit.).
'mostly' means to remove the last letter (most but not all of the word).
'prejudice' becomes 'bias' (synonyms).
'bias' with its last letter taken away is 'bia'.
'pho'+'bia'='PHOBIA'
'of' is the link.
Can you help me to learn more?
(Other definitions for phobia that I've seen before include "Abnormal lasting fear or anxiety" , "Irrational fear of something" , "Overpowering fear" , "Morbid, irrational fear" , "A lasting abnormal fear or dislike" .)