South was in a bit of a hurry here on the above hand from a local club, and, after the queen of spades lead, claimed stating "I will take a* club finesse for the overtrick". East, our old friend with pince-nez who looks (and behaves) like the Secretary Bird, objected, stating that he would duck the jack of clubs and win the second club when the finesse was repeated, and declarer would be one off. South replied that he stated "finesse" not "finesses", and that he would not repeat the finesse with 12 tricks certain at IMPs, but would cash the ace, getting an overtrick safely when West began with ♣Kx. SB was still not happy, arguing that it would be careless to repeat the finesse but still quite normal for someone of South's standard. South objected to that remark and it got quite heated, and the director was called. How do you rule?
*edited by Lamford; original said "the"