Special, Sunday 11 Aug 2019, HalliBilly

Welcome to yet another new setter HalliBilly. Bouquets and Brickbats welcome.

Three answers per commenter as usual till 6 PM (Annotations compulsory)
Please provide all your answers in one comment.

ACROSS
1   Work was stalled as the sun had set on the crooked misty dunes (7)
7   Ali had no quarrel with former political organisation (4,4)
10 Crazily rants with hesitation about earth-dwellers (7)
11 How was he healthy without exercise or outdoor sports? Well… He improvised! (2,6)
12 Wander aimlessly to find creature (5)
15 In complete agreement? Spot on! (7)
16 Tried this on every clue and yet you asked for more of the same (9)
17 A portion finally served by backward, headless god (6)
20 Take in common element and cry over rigid nature (10)
21 The English competed rigorously after having set their heart on Australia’s trophy (6)
22 In short, it’s where man travels across time to befriend aliens (3,2)
23 ‘Woody’ instrument? (8)
24 Been there, done that? Quite the opposite! (5)
25 A gravy with no terminal velocity might end up being jelly-like (4)
26 Travel across London or be someone who lives inside a shell (6)
27 ‘Ache din’ might happen next to a large plantation (8)

DOWN
2   How the pain was actually removed - it needed a healing friend (15)
3   Continuously hammer cycle without leniency (5)
4   Detectors couldn’t catch Anne behind the mountain (4)
5   The entire family prefers variety over communism (7)
6   One went into the loft to find an ancient region (6)
8   Negative energies may be found here (7)
9   “It’s time to move on!”, according to Kramer (5,2)
13 The rat-killer was on a strict diet that involved no cider (11)
14 Substantial climb (5,5)
17 The colouring book has been decaying, so we hear (6)
18 Anyone looking to rise up the ranks must tee off with vital members of society (8)
19 See how they throw in the major league? They deliver in reverse! (8)

Across Lite version can be accessed at HALLIBILLY 1

Enjoy.