For A Change Meaning

(idiomatic) As a departure from the usual.

Example: 1889, Jerome K. Jerome, Three Men in a Boat (To Say Nothing of the Dog),
  He had had a hard time in the City, so he explained. Harris, who is callous in his nature, and not prone to pity, said:
  "Ah! and now you are going to have a hard time on the river for a change; change is good for everyone. Out you get!"
1913, Joe Hill, There Is Power in a Union,
  If you've had "nuff" of "the blood of the lamb,"
  Then join in the grand Industrial band;
  If, for a change, you would have eggs and ham,
  Then come! Do your share, like a man.
1919, W. Somerset Maugham, The Moon and Sixpence,
  "I've supported her for seventeen years. Why shouldn't she support herself for a change?"
1931, Robert E. Howard, The TNT Punch (alternate titles: The Waterfront Law, and The Waterfront Wallop),
  "... But I ain't all softness and mush--feel this here for a change!"
  And I closed the Kid's eye with a smashing left hander.
1993 February 17, Bill Clinton, speech, William Jefferson Clinton's First State of the Union Address,
  I'd like to use that Superfund to clean up pollution for a change and not just pay lawyers.