Female colour bar (8)
I believe the answer is:
lipstick
'female colour bar' 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?
'female colour bar' is the wordplay.
'female colour' becomes 'lip' (I can't justify this - if you can you should give a lot more credence to this answer).
'bar' becomes 'stick' (stick is a kind of bar).
'lip'+'stick'='LIPSTICK'
Can you help me to learn more?
(Other definitions for lipstick that I've seen before include "girl may have to face" , "Type of paint" , "Mouth paint?" , "Facial cosmetic" , "Coloured cosmetic" .)