### Clue: A field away from 1 across turning on pipe, energy producing mushrooms! (12)
### Answer: CHANTERELLES 
 ### Explanation: Definition: mushrooms
 **Reversal of**(… turning) [ "Sellafield"(a UK nuclear facility that includes the decommissioning of the former WIndscale plant and reprocessing spent nuclear fuel, and potentially the site for a new power station) **minus**(… away from) "A field" ] **placed after**(on) [ CHANTER(the pipe of a bagpipe with finger holes) + E(symbol for "energy" in physics) ].