### Clue: A turn in northern waters? (6)
### Answer: NAUSEA 
 ### Explanation: Definition: A turn
 [A + U(-turn;an about-face) ] **contained in**(in) [ N(abbrev. for "northern") + SEA(the waters;the area of water around a particular area, as in "the Scottish waters") ].
Defn: The feeling you'd get if you were seasick.