— Castle, stronghold in County Cork, Republic of Ireland, housing a stone said to endow those who kiss it with the gift of flattery (7)
I believe the answer is:
blarney
(Other definitions for blarney that I've seen before include "The Irish gift of the gab, and Cork Stone" , "Kiss this Stone to get the gift of the gab" , "Irish flattery" , "jaw in Irish pub?" , "Cajoling talk" .)