Cracked up oddly enough (6,4)

I believe the answer is:

broken down

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for broken down that I've seen before include "Analysed" , "worn out" .)

I've seen this clue in The Globe and Mail.

Want a hint initially instead of a full solution? Install my app