Finding worm OK, he arranged preparatory study (8)
I believe the answer is:
homework
'arranged preparatory study' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'finding worm ok he' is the wordplay.
'worm ok he' can be anagrammed to 'HOMEWORK'.
But, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for homework that I've seen before include "Preparation before lesson" , "DIY" , "Work done outside school" , "It's done outside school hours" , "School prep" .)