Nosh with setters followed by hanky-panky around southern county (4,6)
I believe the answer is:
east sussex
'southern county' is the definition.
'east sussex' can be an answer for 'county' (I've seen this before). I'm unsure of the 'southern' bit.
'nosh with setters followed by hanky-panky' is the wordplay.
'nosh with' becomes 'easts' (I can't justify this - if you can you should believe this answer much more).
'setters' becomes 'us' (the crossword setter and their colleagues).
'followed by' says to put letters next to each other.
'hanky-panky' becomes 'sex' (I've seen this before).
'easts'+'us'+'sex'='EAST SUSSEX'
'around' is the link.
Can you help me to learn more?
(Other definitions for east sussex that I've seen before include "English Channel county" , "area that's down a lot" .)