Little bit of racism alleged (5)
I believe the answer is:
small
'little' is the definition.
(I know that little can be written as small)
'bit of racism alleged' is the wordplay.
'bit of' says the answer is hidden in the clue.
'SMALL' is hidden within 'racism alleged'.
(Other definitions for small that I've seen before include "Petite" , "Of little size" , "Diminutive" , "Tiny" , "tiddly" .)