Chronometer in view (5)
I believe the answer is:
watch
This clue is a double definition.
'chronometer' is the first definition.
(I know that chronometer can be written as watch)
'view' is the second definition.
(I know that view can be written as watch)
'in' is the link.
(Other definitions for watch that I've seen before include "Observe - timepiece" , "Observe - guard" , "Keep under observation" , "Keep an eye on - timepiece" , "See 21" .)