### Clue: Greatest golfer, Ernie, is below standard in matches (9)
### Answer: PARALLELS 
 ### Explanation: Definition: matches
  {ALL(everything,greatest possible) ELS(Ernie, S. African former World No.1 golfer, a favourite of crossword setters)} **placed after**(is below, in a down clue) PAR(a standard, such as in the number of strokes for a round of golf)