Proper choice at junction? (5)
I believe the answer is:
right
I believe this clue is a double definition.
'proper' is the first definition.
(I know that proper can be written as right)
'choice at junction?' is the second definition.
(you might choose left or right at a junction)
(Other definitions for right that I've seen before include "Genuine" , "Sound" , "Correct; appropriate" , "Correct; proper" , "Due" .)