Special, Sunday 25 Aug 2019, Raju Umamaheswar

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

ACROSS
1   Bill gets free bitter (5)
4   Supporter concealing piece of malicious chatter (9)
9   Revolutionary led island to overwhelming victory (9)
10 Substitute chocoholics are really outraged by, initially (5)
11 It's allowable, but shocking, when laid on the line (6)
12 Stable with one acceptable horse (8)
14 A number impair the efficiency of probation (9)
16 Belief in sacred objects (5)
17 Seaman returning to deck, sort of (5)
19 Identified tune with help, backing by newspaperman (9)
21 Someone questioned when an explosive device is found in river (8)
22 One leaving home  before catching plane (6)
25 I had quickly found island, in a manner of speaking (5)
26 Celandine flourished every so many years (9)
27 Observes way in which advertisement's introduced make-up (9)
28 Give a  termination to pain? (5)

DOWN
1   Where you can see washing at every point (3,5,3,4)
2   Restore Frenchman to wife (5)
3   Annoyance expressed by "Hell" and "Blast" (7)
4   Gathering to cook (4)
5   Beanstalk wouldn't indulge in gossip (4,3,3)
6   Rustic with a lot of objection in pain (7)
7   Sailor Head contains the Princess for unpunctuality (9)
8   Fairy's dressing of wool led to change (5,10)
13 Without regard to the consequences, like an  American preying bird ? (4-6)
15 Adaptable relatives adapted. (9)
18 Victory (with valuable card I held) over Helen ( 7)
20 He may hold shares in pit, in one that's fraudulent (7)
23 Beaver skin after completion of dressing (5)
24 Almost lower boat (4)

Across Lite version can be accessed at RAJU U 17

Enjoy.