Yes, I must leave PM on fringes of remote county (8)
I believe the answer is:
ayrshire
'county' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'yes i must leave pm on fringes of remote' is the wordplay.
'yes' becomes 'ay'.
'i must leave pm' becomes 'shir' (I can't explain this - if you can you should believe this answer much more).
'on' means one lot of letters goes inside another.
'fringes of' means to remove the middle letters.
'remote' with its centre taken out is 're'.
'shir' inserted inside 're' is 'rshire'.
'ay'+'rshire'='AYRSHIRE'
Can you help me to learn more?
(Other definitions for ayrshire that I've seen before include "part of Scotland" , "cow, perhaps" , "Historic county of Scotland" , "Old county; cattle breed" , "Hardy breed of Scottish dairy cattle" .)