One Kent resort, perfect (5)
I believe the answer is:
ideal
'perfect' is the definition.
('ideal' can be similar in meaning to 'perfect')
'one kent resort' is the wordplay.
'one' becomes 'i' (Roman numeral).
'kent resort' becomes 'deal' (I've seen this before).
'i'+'deal'='IDEAL'
(Other definitions for ideal that I've seen before include "Most suitable" , "Paradigm" , "Best possible" , "Pattern" , "that can't be bettered?" .)