Three answers per commenter as usual till 6 PM (Annotations compulsory)
Please provide all your answers in one comment
ACROSS
1 Father concealing deceit ultimately backs risky speculations (6)
4 Criticize harshly! Shocking to grab single female (7)
8 Summon strike first and run riot (7)
9 Girl with evidence backing dissident (7)
11 Singer, endlessly conceited, lousy in circuit (10)
12 Mountaineers plausibly keep going around mountains (4)
13 Forgetting name, relatives recollect unusual but friendly form of address (5)
14 Largely overindulge devouring a lot, possibly leading to this? (8)
16 Take a bath perhaps and be overtly flirtatious? (3,5)
18 Mockery! Bit unfair on youngster (5)
20 Swimmer beginning to accelerate in concluding event (4)
21 Business associate admits debt is on a massive scale (10)
23 Plans to hide his reckless misadventures (7)
24 Ace by wife captures king, finally making contract (7)
25 Utter...utter radio silence (4,3)
26 Grain given by sailors in barge (6)
DOWN
1 Right to take in student showing talent (5)
2 How poet introduced himself? Shut up! (7)
3 A character chasing girl in skirt! That's nonsense (9)
5 Take away suspicious parcel unopened (5)
6 Top arts centre renovated to stage a past event (7)
7 Shallowness and impertinence by Trump finally breaks illusion (9)
10 Jump to embrace maiden with body that's a stunner (9)
13 What one might do with champagne bottle to delay action? (4,2,3)
15 Possible to disregard old boy crushed by weapon that is thrown (9)
17 Fellow flogged and shot (7)
19 Victory for Republican! Speech gets applause (7)
21 Caught pair cavorting in Italian island (5)
22 Allowed princely leader to change sides (5)
Across Lite version can be accessed at IXL 18 Final 2
Enjoy.