A cheese that's made round (4)
I believe the answer is:
edam
'a cheese' is the definition.
(Edam is an example)
'made round' is the wordplay.
'round' says the letters should be written backwards.
'made' in reverse letter order is 'EDAM'.
'that's' acts as a link.
(Other definitions for edam that I've seen before include "Hard Dutch cheese" , "Made into a nice cheese" , "edible sphere" , "Dutch food" , "Cheese made in Holland" .)