Coercion by threat (6)
I believe the answer is:
duress
'coercion by threat' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for duress that I've seen before include "Constraint, Compulsion" , "Threats, violence, etc, used in coercion" , "Restraint" , "Coercion, pressure" , "Compulsory force or threat" .)