This crossword No. 978 clues and answers were published on Sun 22 Jun 2014 and the puzzle can be visited by following The Guardian Speedy Crossword No. 978 link.
All Across Clues and Answers:
1-across – Tempter of mankind; master of Hell : BEELZEBUB
8-across – Fibre of polymeric amides : NYLON
9-across – Nostrum : PANACEA
10-across – Rhinitis resulting from an allergic reaction to pollen : HAYFEVER
11-across – See 16 : DICK
13-across – Dried red grape : RAISIN
14-across – Thorny desert plant : CACTUS
16-across – 19th century novel by Herman Melville : MOBY
17-across – Disease caused by a thiamine deficiency : BERIBERI
19-across – Song title shared by Sondheim-Bernstein and Paul Simon among others : AMERICA
20-across – The only son of Abraham : ISAAC
21-across – Transport : ENRAPTURE
All Down Clues and Answers:
1-down – UK’s highest mountain : BENNEVIS
2-down – Spotted : ESPIED
3-down – Blue-white metallic element, atomic number 30 : ZINC
4-down – At some earlier time : BACKINTHEDAY
5-down – Pict backlash? : BLACKASPITCH
6-down – Storming about, behaving violently : ONTHERAMPAGE
7-down – Proceeds instinctively : PLAYSITBYEAR
12-down – Bordering on the sea : MARITIME
15-down – Illusion that a new experience had occurred previously : DEJAVU
18-down – Curling bit of smoke, hair, etc : WISP
This crossword has in total 22 where 12 are across and 10 are down.