Was involved in and worried about (9)

I believe the answer is:

concerned

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'worried about' is the definition.
'concerned' can be an answer for 'worried' ('concern' can be a synonym of 'worry'). I'm not sure about the 'about' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for concerned that I've seen before include "Feeling or showing worry or solicitude" , "anxiety" , "Involved - worried" , "Worried, anxious" .)

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