Understood to have become entangled with (6,2)
I believe the answer is:
caught on
'understood' is the definition.
The definition and answer can be both related to thinking as well as being past participle verbs.
Perhaps you can see a link between them that I don't see?
'to have become entangled with' is the wordplay.
I cannot really understand how this works, but
'to' is within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for caught on that I've seen is " Comprehended - became fashionable".)