Coercion; constraint (6)
I believe the answer is:
duress
I believe this is a double definition.
'coercion' is the first definition.
(under duress means being coerced)
'constraint' is the second definition.
(I've seen this in another clue)
(Other definitions for duress that I've seen before include "Threat of coercion" , "Constraint, Compulsion" , "Constraint, coercion" , "Constraint, force" , "Threats, violence, etc, used in coercion" .)