OUT IN __

• Out of __ (from nowhere)
• Position behind shortstop
• Site of Fenway Park's Green Monster
• Source of bizarre ideas, so to speak
• Where the unexpected 'comes out of'
• Symbol of remoteness
• Where Why is, in "Who's on First?"

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

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.