Short show Kate adapted is a classic (3,4)
I believe the answer is:
the oaks
'is a classic' is the definition.
(I've seen this before)
'short show kate adapted' is the wordplay.
'short' means to remove the last letter.
'adapted' indicates anagramming the letters.
'show' with its last letter removed is 'sho'.
'sho'+'kate'='shokate'
'shokate' is an anagram of 'THE OAKS'.
(Other definitions for the oaks that I've seen before include "Race run at Epsom" , "Epsom classic" , "Race held at Epsom" , "One particular stand" , "Classic English horse race" .)