Break clasp (6)
I believe the answer is:
buckle
This might be a double definition.
'break' is the first definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps you can see an association between them that I don't see?
'clasp' is the second definition.
('buckle' can be a synonym of 'clasp')
Can you help me to learn more?
(Other definitions for buckle that I've seen before include "Fastener on belt or shoe" , "Bend out of shape" , "(E.g. belt) fastener; crumple" , "Collapse under pressure" , "Catch" .)