Coercion (3-8)
'coercion' is the definition.
(under duress means being coerced)
This is all the clue.
(Other definitions for duress that I've seen before include "Threats, violence, etc, used in coercion" , "Coercion, compulsion" , "Compulsion by use of force" , "Illegal coercion" , "Hardship" .)
(Other definitions for drive that I've seen before include "Trip in car - road to house" , "Road off main highway" , "offensive" , "Control and steer vehicle" , "Private road; impel" .)
(Other definitions for clasp that I've seen before include "Close hands round" , "Fastening - firm grip" , "Part of a necklace" , "Grip firmly" , "Catch hold" .)
'coercion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for force that I've seen before include "Physical strength" , "fall" , "Powerful effect or influence" , "Violence" , "Muscle" .)