Dairy cow jumper (8)
I believe the answer is:
guernsey
This clue could be a double definition.
'dairy cow' is the first definition.
(Guernsey is an example)
'jumper' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
Can you help me to learn more?
(Other definitions for guernsey that I've seen before include "Source of milk" , "Lyric poem" , "Second-largest Channel Island" , "Second largest Channel Island" , "Lower" .)