Hawk seen in Home Counties, going over lines (4)
I believe the answer is:
sell
'hawk' is the definition.
(thesaurus)
'home counties going over lines' is the wordplay.
'home counties' becomes 'se'.
'going over' means one lot of letters go next to another.
'lines' becomes 'll' (I've seen this in other clues).
'se'+'ll'='SELL'
'seen in' is the link.
(Other definitions for sell that I've seen before include "Exchange goods etc. for money" , "Dispose of, maybe in 23" , "Flog" , "Vend, auction off" , "Traffic" .)