Clue: Here xenophobes break out and sleep with Poles outside (6,5)
Answer: BAKER'S DOZEN
Explanation: Definition: Here xenophobes

***(break)** [anag:*out*] + **DOZE** with **N,S** (North and South, so "poles") *outside*
 
*The definition refers to the solution to 13 across, 13 being a "baker's dozen".