I've been searching for intersections among Shakespeare, the Orion constellation and Only Fools And Horses, so far without success. Cassandra appears in Troilus And Cressida, and fits the letter count, but has nothing to do with Orion as far as I know. Other than that, nothing.
I suspect I'm barking up the wrong tree. Wyatt you plonker.
Ah! Rio Ferdinand. I didn't know he was from Peckham, and I was assuming that the three letter word at the start was something insignificant like "the", because it was missing from the first formulation. But I think it was a fair clue: not strictly Ximenean as it lacks an orthodox definition part, but perfectly cool.