Grasped what they should have done with the day, perhaps (6)
I believe the answer is:
seized
'grasped' is the definition.
The answer and definition can be both to do with contact as well as being past participle verbs.
Perhaps there's an association between them I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for seized that I've seen before include "Appropriated, contraband perhaps" , "Caught" , "Took by force" , "Grabbed hold of" , "Took hold of" .)