### Clue: Woods' warnings approaching first at Troon (6)
### Answer: FOREST 
 ### Explanation: Definition: Woods
 FORES(warnings to watch out for an approaching ball on the golf course, possibly given by Tiger Woods) **plus**(approaching) **the 1st letter of**(first at) "Troon ". A reference to Tiger Woods and the 1st hole at the Royal Troon golf course, a British Open Championship venue.