Prejudice shown by British international -- when? (4)
I believe the answer is:
bias
'prejudice' is the definition.
('bias' can be a synonym of 'prejudice')
'shown by british international when?' is the wordplay.
'shown by' means one lot of letters go next to another.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'international' becomes 'i' (abbreviation eg in IMF).
'when?' becomes 'as'.
'b' put next to 'i' is 'bi'.
'bi'+'as'='BIAS'
(Other definitions for bias that I've seen before include "Prejudice, one-sidedness" , "A leaning or prejudice" , "Inclination of prejudice" , "One-sided prejudice" , "Unfairly influence" .)