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15 Across, More abrupt operator finally interrupting transport enquiry? Not entirely (8) ??U?????

17 Across, Defender shooting is to have unlooked-for consequences (8)
?A?K?I?? BACKFIRE?

18 Across, Applauds self-sacrificing explorer securing victory? (6) O?????

24 Across, Tail on dog wags, indicating canine problem? (10) O???T?????

Many thanks in advance

Bus query +r - last letter of operator- brusquer?

18 Ovates, applauds. Oates is the explorer, with (securing) V for victory.

Backfire looks kosher
Oates+ v - ovates?

Odontalgia? canine teeth

Yes ab, anagram

Many thanks everyone.

I think it should be tail on A dog.