15A: "One trying to get copper coin from the past."
I have otherwise completed this puzzle, but can't help wondering if there is an error in this clue. There are two solutions I'm contemplating that both mean the same value old British coin. One matches the wordplay ('one trying') but not the crossing letter from 2 down; the other fits with 2 down, but I cannot see how the wordplay gives that solution (using Chambers and Bradford's). Both possibilities fit with the other crossers from 3 and 14 down.
What am I missing?! I can be more specific about my two solutions if needed...