### Clue: Six in regatta tragically sink (9)
### Answer: GRAVITATE 
 ### Explanation: Definition: sink
  VI(Roman numeral for six) **contained in**(in) **anagram of**(tragically) REGATTA.
Answer:  To sink to earth, under the force of gravity.  It could also mean to move to  a figurative source of attraction, but then it would not necessarily be to sink.