Negative word embraced by politician, ordinarily (3)
I believe the answer is:
nor
'negative word' is the definition.
(I've seen this before)
'embraced by politician ordinarily' is the wordplay.
'embraced' indicates a hidden word.
'NOR' is hidden in the letters of 'by politician ordinarily'.
(Other definitions for nor that I've seen before include "Negative word" , "And not either" , "Neither one ... the other" , "Conjunction meaning 'and not'" , "Negative conjunction" .)