Having googled the puzzle number to check if something was missing from the clue I was directed to a part blog which said this was a thematic puzzle. There should be something in the preamble which helps explain if (and possibly how) some clues are affected.
Hi elle, I didn't go into the full blog so I don't know the specifics but it certainly would satisfy that part of the clue (a homophone that is not dialect dependent, how refreshing !).