Showing no compassion at any time in Kent? (6)
I believe the answer is:
severe
'showing no compassion' is the definition.
(severe can mean ruthless or lacking in compassion)
'any time in kent?' is the wordplay.
'any time' becomes 'ever' (I've seen this in another clue).
'in' is an insertion indicator.
'kent?' becomes 'se' (Kent is part of the South East of England).
'ever' inserted inside 'se' is 'SEVERE'.
'at' is the link.
(Other definitions for severe that I've seen before include "sober" , "Strict and unbending" , "Austere, spartan" , "Serious or strict" , "Austere, harsh (6)" .)