Site of Fenway Park's Green Monster

• The piece of ground in the outfield on the catcher's left
• Where Why is, in "Who's on First?"
• Area patrolled by Jim Rice
• Figuratively, whence some unexpected ideas
• Source of bizarre ideas, so to speak
• Out of __ (from nowhere)

Wikipedia Word definitions in Wikipedia
Leftfield is a British electronic music group formed in 1989. Until 2002, Leftfield was a duo of artists and record producers that consisted of Neil Barnes and Paul Daley (formerly of the Rivals , A Man Called Adam and the Brand New Heavies ). In January ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
left field \left` field"\, leftfield \left`field"\n. (Baseball) the part of the outfield on the catcher's or batter's left. Syn: left.

Wiktionary Word definitions in Wiktionary
a. From wikt:left field; off-the-wall