Field something round (6)
I believe the answer is:
circle
This clue is a double definition.
'field' is the first definition.
(thesaurus)
'something round' is the second definition.
(I know that circle is circular)
(Other definitions for circle that I've seen before include "Clique; loop" , "Ring - round" , "Round shape" , "Geometric figure" , "Seats above theatre stalls" .)