General crossword

Try this one (already published in a newspaper supplement):

Across
4) Film personality Walter Elias … (6)
7) An overland expedition, particularly for hunting or exploration. (6)
9) Desi car or Megasthenes’ account of the Maurya empire. (6)
10) Waterfall, opacity of the lens. (8)
11) A decorative bow, a problem or a speed unit. (4)
12) ‘Any of various isomeric paraffin hydrocarbons with the formula C8H18, found in petroleum and used as a fuel and solvent.’ (6)
13) Raghuram Rajan’s book talks about saving capitalism from them. (11)
18) … of Sion, written about in the Da Vinci Code. (6)
20) Impel. (4)
21) Male roe deer collectively sounding like branded shoes. (8)
22) Defined as a set of bit that represents a graphic image. (6)
23) Term in Sanskrit for the ‘way of the higher truths.’ (6)
24) A group which fixes prices, limits supply and competition. (6)

Down
1) Alfred Hitchcock thriller, insane (slang). (6)
2) Vishnu’s incarnation, also called Halayudha. (8)
3) Optical phenomenon or a military aircraft. (6)
4) East African country. Anagram: IJI DOUBT! (8)
5) The Japanese abbreviation of a phrase meaning ‘the digits must remain single.’ (6)
6) Asset put into the custody of third party for delivery only after the fulfillment of specified conditions. (6)
8) Navigation plan possibly first conceived in 1860 by Commander A. D. Taylor of the Indian Marines. (13)
14) This international organisation is headed by Ronald K. Noble and its General Secretariat is in Lyon, France. (8)
15) A seat or court of justice. Anagram: LATRUNIB (8)
16) Russian for collection of three … (6)
17) Pierre de —, known for his ‘last theorem.’ (6)
18) False, fake. (6)
19) ‘A person of unquestioning obedience.’ (3-3)