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18 ac Endangered edible large deep-sea creature (9)
??O?H?I?H

swordfish?

Thanks for reply - I had thought of that, but can't get it to fit with the "h" which I think is right from 15dn.
15dn Scot whose bequest allows Glasgow University students to go to Balliol. Am sure answer to that is John Snell

what about TOOTHFISH?

Thanks Scarlett. That fits.