Straight after vacating, get blue? (5)
I believe the answer is:
arrow
'straight' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'after vacating get blue?' is the wordplay.
'vacating' means to remove the middle letters (I've seen 'vacated' mean this).
'get blue?' becomes 'row' (I am not sure about this - if you are sure you should believe this answer much more).
'after' with its middle taken out is 'ar'.
'ar'+'row'='ARROW'
Can you help me to learn more?
(Other definitions for arrow that I've seen before include "This points" , "Direction symbol" , "Arm" , "one found near Bow?" , "Cupid's projectile" .)