Snub I assume hides prejudice (4)
I believe the answer is:
bias
'prejudice' is the definition.
(I know that prejudice can be written as bias)
'snub i assume hides' is the wordplay.
'hides' says the answer is hidden in the clue.
'BIAS' is hidden in the letters of 'snub i assume'.
(Other definitions for bias that I've seen before include "Prejudice, one-sidedness" , "An influence against, prejudice" , "Favouritism" , "A leaning or prejudice" , "Inclination of prejudice" .)