Clue: Rains heavily on A1, heading north somewhere in Central Europe (7)
Answer: SILESIA
Explanation: Rains heavily on A1, heading north somewhere in Central Europe (7)
**SILES **("rains heavily") + <=**A1 **Hadn't come across "sile" before, but apparently it's a Northern English dialect word for "pour with rain". Silesia is a region of Europe, mostly in Poland.