Making U-turn, body of scientists cite negative results in DNA research (8)
I believe the answer is:
genetics
'dna research' is the definition.
'making u-turn body of scientists cite negative results' is the wordplay.
'making u-turn' is a reversal indicator.
'body of' says the answer is hidden in the clue (body can mean the inside of something).
'sciteneg' is hidden in the letters of 'scientists cite negative results'.
'sciteneg' back-to-front is 'GENETICS'.
'in' acts as a link.
(Other definitions for genetics that I've seen before include "Study of inherited characteristics" , "Science of heredity" , "The study of biological heredity" , "Branch of biology" , "The scientific study of heredity" .)