W serving-girl unloaded donkey? (5)
I believe the answer is:
glass
'w' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'girl unloaded donkey?' is the wordplay.
'unloaded' means to remove the middle letters (the content of the word is unloaded).
'donkey?' becomes 'ass' (ass is a term for a donkey).
'girl' with its centre removed is 'gl'.
'gl'+'ass'='GLASS'
'serving' acts as a link.
Can you help me to learn more?
(Other definitions for glass that I've seen before include "Vitreous material" , "Watch-face cover" , "Tumbler, mirror" , "Calm lake may be compared to this" , "Goblet" .)