A cheese that's made round (4)
I believe the answer is:
'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 "Dairy product", "Dutch market town famous for its cheese", "Made (anag) - Dutch cheese", "something to have with crackers", "Kind of cheese".)