Alsatian who is kept by day in pound (4)
I believe the answer is:
quid
This could be a double definition.
'alsatian who is kept by day' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'pound' is the second definition.
('quid' can be a synonym of 'pound')
'in' acts as a link.
Can you help me to learn more?
(Other definitions for quid that I've seen before include "bit of bread" , "Wad of chewing tobacco" , "Pound sterling (slang)" , "- - pro quo" , "One fifth of a fiver" .)