I raised the question of clues relying on pronunciation for their solution a couple of crosswords ago. The clue for 17ac of the 1141 Cryptic Jumbo is, to my mind, another dodgy one:
"Take great pleasure when speaking language" (6).
The answer, " BASQUE" , had me stumped until I got the "U" from the down clue.
As my daughter, who speaks with RP, pointed out, she pronounces "Basque" and "bask" differently. To me, who does not have RP ,they
sound the same. Perhaps the setter, like me, is a northerner....