Temporary vintage carrier bag for one girl (9)
I believe the answer is:
wineglass
'temporary vintage carrier' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'bag for one girl' is the wordplay.
'bag' becomes 'win' (I can't justify this - if you can you should believe this answer much more).
'for one' becomes 'eg' (both can mean 'for example').
'girl' becomes 'lass' (lass can informally mean a girl).
'win'+'eg'+'lass'='WINEGLASS'
Can you help me to learn more?
(Other definitions for wineglass that I've seen before include "Vessel with bowl and stem" , "possibly held in this port? The opposite" .)