Maybe Treebeard's inclined to get involved (9)
I believe the answer is:
entangled
'involved' is the definition.
(similar in meaning)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for entangled that I've seen before include "snarled up" , "caught" , "Confusedly twisted" , "Involved in complications" , "Intertwined; entrapped" .)