Notice shade before unseen area (5,4)
I believe the answer is:
blind spot
'unseen area' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'notice shade before' is the wordplay.
'notice' becomes 'spot' (spot can mean to notice or observe).
'shade' becomes 'blind' (I've seen this before).
'before' means one lot of letters go next to another.
'spot' put after 'blind' is 'BLIND SPOT'.
Can you help me to learn more?
(Other definitions for blind spot that I've seen before include "Area where vision is obstructed" , "source of misunderstanding?" , "Unseen area of road" , "Hazard for driver" , "where one cannot see" .)