The drunk's dog? (7)
I believe the answer is:
lurcher
This clue might be a double definition.
'the drunk's' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'dog?' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for lurcher that I've seen before include "moving suddenly and unsteadily?" , "one making staggering movements" , "Not a sure-footed" , "A greyhound cross" , "A cross between sheepdog and retriever" .)