Build non-racist force (9)
I believe the answer is:
constrain
'force' is the definition.
(I've seen this before)
'build non-racist' is the wordplay.
'build' indicates an anagram.
'non'+'racist'='nonracist'
'nonracist' is an anagram of 'CONSTRAIN'.
(Other definitions for constrain that I've seen before include "Restrict the extent of" , "Check" , "Lock up" , "Severely restrict" , "Restrict scope of (an activity)" .)