Regarding sensibly (5)
I believe the answer is:
eying
'regarding sensibly' is the definition.
The definition and answer can be both to do with perception as well as being present participle verbs.
Maybe they are linked in a way I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for eying that I've seen before include "Ogling," , "Observing" , "In the process of close scrutiny" , "Watching closely" , "Fixated on" .)