Notice place (4)
I believe the answer is:
spot
I believe this is a double definition.
'notice' is the first definition.
(spot can mean to notice or observe)
'place' is the second definition.
(I know that place can be written as spot)
(Other definitions for spot that I've seen before include "Notice; sign of acne" , "point on snooker table" , "Blob" , "moral flaw" , "Sight - site" .)