First to get girls drinking vessels (7)
I believe the answer is:
glasses
'drinking vessels' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'first to get girls' is the wordplay.
'first to' suggests taking the first letters.
'girls' becomes 'lasses' (lass can mean a girl).
The initial letter of 'get' is 'g'.
'g'+'lasses'='GLASSES'
Can you help me to learn more?
(Other definitions for glasses that I've seen before include "Spectacles and receptacles" , "Spectacles or drinking containers" , "are they full of alcohol?" , "Help in making out" , "Barnacles" .)