### Clue: Warn pidgin changes tack in the US (7,3)
### Answer: DRAWING PIN 
 ### Explanation: Warn pidgin changes tack in the US (7,3)
***(warn pidgin) ***I was a bit bemused by the "in the US" bit of the clue, but Chambers entry for "tack" says "drawing pin (N. Am.)". I've always called tacks drawing pins.