Figuratively, whence some unexpected ideas

• The piece of ground in the outfield on the catcher's left
• OUT IN __
• Where the unexpected 'comes out of'
• Area patrolled by Jim Rice
• Source of bizarre ideas, so to speak
• Site of Fenway Park's Green Monster
• Out of __ (from nowhere)

Wikipedia Word definitions in Wikipedia
Leftfield or left field may also refer to: Left field , a position in baseball The Leftfield , an event at a number of British music festivals Leftfield , a British electronica duo Leftfield , a music genre Leftfield Magazine , the magazine of Scottish ...