Anxious to be involved in (9)
I believe the answer is:
concerned
This clue might be a double definition.
'anxious' is the first definition.
(similar in meaning)
'involved in' is the second definition.
'concerned' can be an answer for 'involved' (thesaurus). I am not sure about the 'in' bit.
'to be' is the link.
Can you help me to learn more?
(Other definitions for concerned that I've seen before include "anxiety" , "Involved - worried" , "Feeling or showing worry or solicitude" , "Worried, anxious" .)