Trying experience in centre of historical Kent town (6)
I believe the answer is:
ordeal
'trying experience' is the definition.
(I've seen this before)
'centre of historical kent town' is the wordplay.
'centre of' says to take the centre.
'kent town' becomes 'deal' (I've seen this before).
The middle of 'historical' is 'or'.
'or'+'deal'='ORDEAL'
'in' is the link.
(Other definitions for ordeal that I've seen before include "very hard test" , "Suffering - trial" , "Severe trial" , "Horrible experience" , "Severly trying experience" .)