No particular problems with the grid fill, finding the 10 letters, or drawing the decagon, but then a screeching halt. The shape and the title suggest an athletics direction, and a 5 letter name, but the 11 letters from the vertices seem to only provide the name of a small UK town, as then... there are ten thematic clue answers? So my initial thought seems like a rabbit hole.
I hate to use the phrase Guess What I'm Thinking since it's often the case that it's me who's just not thinking, but it seems like Pointer could have included a few more, er, pointers as to the theme. Any hints?