Roundish shape (4)
I believe the answer is:
oval
'roundish shape' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oval that I've seen before include "Egg shape - Kennington test match venue" , "6D 5A [TUBE STATION]" , "Ashes Test venue" , "Courageous" , "Geometric shape" .)