Thursday Morning Riddle

I’m the small jurisdiction for refs or an ump;
I am similar work where professionals clump;
I’m a place to grow corn; I played mother to Gump;
And a non-track event like a throw, vault, or jump.

Who am I?

UPDATE: Riddle solved by Jason. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Jason Says:

    Field

  2. Bill Says:

    FIELD is correct. Way to go, Jason!

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