Twisting (7)
I believe the answer is:
torsion
'twisting' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for torsion that I've seen before include "White-berried parasite" , "Twisted position - no riots (anag)" , "Process of twisting" , "The act of twisting" , "Twisting action" .)