Myron, it's too late to make hedges on other players as the 3rd round has already started - early because of weather forecast for later in the day.
You could use the WSEX interactives to sell Singh and Clarke so that you get a guaranteed return if they don't win.
Alternatively, if you can open an account and deposit funds with them today, you could use
www.betfair.com which is a betting exchange. Basically you act as the bookie as you could offer Singh @ 6/4 and Clarke @ 9/1 at which there is a lot of interest for. It is the best way to hedge, but it is most convenient for UK punters.