nice - I estimate the value between $250 and $750. Good short name. Easy to remember. The .net is a detractor from the value, but I don't think it hurts this name very much because it will appeal to intellectual types who won't shy away from visiting a .net tld.
You could make some money if you used it to set up an online bookstore selling books about crosswords, or if you set up a subscription service to access online crossword puzzels. You might also get some traffic with daily or weekly puzzels, and then focused advertising.