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Assistance in parsing these would be appreciated:-
17 Down - "Three little elements, he says" SIMON
(I can see several elements in the answer but cannot
see all three together).
25 Across - "Aled described: 'backward man' " DANIEL
21 Down - "Flapper experiences back trouble" SAIL
(Somehow involves "AILS" I guess)

17d si silicon

mo molybdenum

n nitrogen

Thanks, Stevie Gee - not too hot on my periodic table! Could see "oxygen" and "nitrogen" but they wouldn't have done me a lot of good!