Definition of "cleanup"

The starting lineup for Newark consisted of Johnny Neun leading off at first base; the number two hitter was catcher Norman Kies; batting third and playing second base was Andy Cohen; at cleanup was "The People's Cherce," Dixie Walker; George Selkirk was hitting fifth and playing right field; Bob Barrett was at third base and hitting sixth; Jess Hill was the number seven batter in left field; Red Rolfe batted eighth and played shortstop; and the right-hander, George Miner, was on the mound.

1994, Ronald A. Mayer, The 1937 Newark Bears: A Baseball Legend, page 27

There it was: McDougald at cleanup, and DiMaggio fifth.

2000, Richard Ben Cramer, Joe DiMaggio: The Hero's Life, page 528

I had been getting hits off Jim Palmer and had a streak going and went from hitting 8th to 7th, to 6th, 5th, and then finally McKeon put me in at cleanup.

2010, Kenneth Hogan, Batting 10th for the Yankees