All these are intensely interested! (4)
I believe the answer is:
eyes
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for eyes that I've seen before include "They're said to be the mirrors of the soul" , "Regards -- features of a potato" , "Poetically, they're the windows of the soul" , "Narrowly watches" , "They see and" .)