In short, endless cheese (4)
I believe the answer is:
brie
'cheese' is the definition.
(I know that Brie is a type of cheese)
'in short endless' is the wordplay.
'in short' becomes 'brief'.
'endless' means to remove the last letter.
'brief' with its last letter taken away is 'BRIE'.
(Other definitions for brie that I've seen before include "Round soft Fr. cheese" , "Soft, creamy French cheese" , "Bergamot-flavoured tea" , "French cream cheese" , "dairy product" .)