Another one who picked the wrong last letter for 15a then wondered how the musician was spelled . I assumed it was with the wrong last letter and couldn't see how the clue worked.
If most people got the wrong last letter in 15a maybe the setter got it wrong?
Sheesh. All done apart from 13D. Never in my life have I heard the word corporation used in relation to stomach/ tummy. Is this perhaps a ‘suvvern’ expression? Hopefully now safely tucked away in the memory vaults for future use.
In my experience, TUM for "corporation" is fairly frequent in crosswords (second to CO of course), with the other tummy variants also occurring from time to time.