It can be measured with a protractor (5)
I believe the answer is:
angle
'it can be measured with a protractor' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for angle that I've seen before include "Point of view - associated with Saxon" , "that is often right" , "one of the old people" , "Point of view - fish" , "Gradient" .)