1 Across: Prepare food, very quickly, whip ... up (9)

2 Down: John Lennon's Japanese-born wife, Yoko ... (3)

3 Down: A female head of a family (9)

4 Down: England (abbr.) (3)

5 Down: Tau cross, a cross resembling the Greek letter ... (3)

6 Down: Grudge, ... will (3)

7 Down: People of either sex (informal) (4)

8 Down: Attackers (10)

9 Down: Used to slow free fall (9)

10 Down: Cover with masonry, especially for fortification; hint: relocate "r" in "evert" (5)

11 Across: One's grandmother (informal) (4)

12 Across: Increase the size of (7)

13 Down: Capturer (6)

14 Across: Innocent of a formal charge (3,6)
14 Down: One who is recently married (5-3)

15 Down: A device used to ignite a fire (7)

16 Down: A large collection of tents forming makeshift accommodation for homeless people (4,4)

17 Across: Search and rescue (1,1,1)

18 Across: Adventure (8)

19 Across: Become white (6)

20 Down: Happily Ever After (1,1,1)

21 Across: Universal Time Coordinated (1,1,1)

22 Across: A meadow (literary), an anagram of ale (3)

23 Across: Goodbye! (a Hawaiian word) (5)

24 Across: A yard long measuring stick, typically divided into inches (9)

25 Across: Transformer Rectifier Unit (3)

26 Down: Able to be resumed (9)

27 Across: One who repeats or imitates (6)

28 Down: Cop, police ... (7)

29 Across: Small short-bodied dogs (8)

30 Across: Short for defragment (Computing) (6)
30 Down: A town in the Netherlands; noted for its blue delft pottery (5)

31 Down: To point a weapon at (3)

32 Down: With a whining tone (5)

33 Across: Noha's son (Bible); hint: reposition the last letter in "hems" (4)
33 Down: Common sedimentary rock; (hint: reposition the last letter in "hales") (5)

34 Across: Magic involving evil spirits (5,5)

35 Down: Amateur Rowing Association (UK) (1,1,1)

36 Down: Key English Test (1,1,1)

37 Down: A town in Ayrshire (Scotland) (3)

38 Across: Inhabitant of Saudi Arabia (4)

39 Across: Unlimited freedom to act, a ... rein (4)

40 Across: A person who gives the signal for commencing a race (7)

41 Across: Yemenite, a person whose ancestors were formerly resident in ... (5)