Field a ball perhaps (6)

I believe the answer is:

sphere

This clue is a double definition.

'field' is the first definition.
(I know that field can be written as sphere)

'a ball perhaps' is the second definition.
(I know that ball is a type of sphere)

(Other definitions for sphere that I've seen before include "Ball, bubble" , "All-rounder" , "Shape of the Earth" , "Globe or ball" , "Perfectly round solid geometric figure" .)

I've seen this clue in The Globe and Mail and The Telegraph.

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