ACROSS
1 - Drink brand has been announced (4) - MARC (~mark)
9 - Speedster may encounter this on a road trip (4-2,9) - HEAD-ON COLLISION [CD]
10 - Dinner is inside for some Alaskans (4) - MEAL [T]
11 - Sprays of flowers (5) - ROSES [CD]
12 - Weight of the holding device (4) - LASH ? (Correction - LAST [DD] - Thanks to Bhavan, see his comment)
13 - Nine are in trouble over a nonsensical conversation (5) - IN{A}NE*
14 - Form of riot control in Texas dismissing ten around an Arab at midnight (7) - {TE(-x){AR} {G}AS}
16 - Mostly colour the disciple’s turned jacket (7) - {PEAC(-h)}OAT Anno pending)
18 - Turn the vessel on the submarine (1-4) - {U}-{BOAT}
22 - Large pipe on the road (4) - MAIN [E]
23 - Jokingly showing in the main functions (2,3) - IN FUN [T]
24 - Hits the real pest every second (4) - {R}{A}{P}{S}
25 - Measure undertaken for the success of a gigantic plant outreached to take-off (6,9) - GOLDEN PARACHUTE(-t)*
26 - Trees have a foul smell outside (4) - ELMS* Where did one L go?

DOWN
2 - Campaign for a new Democratic leader is being broadcast around Los Angeles (7) - {A}{N}{D}{O{LA}N} This is the Hindi word for Campaign
3 - Arguments that leave out the rock group from the reformations, cannot be changed (14) - CONFRONTATIONS(-rem-a)* Where did the A go?
4 - To stagger around the British revolutionary (5) - RE{B}EL
5 - Warm sentiment (5) - TOAST [CD] Nice clue
6 - It may help to cast-off the broken bones! (7,7) - PLASTER BANDAGE [CD] Don't ask me how
7 - Class of stone a character has in Libya (6) - {A}{SH{L}A}R R is the character?
8 - Company has a booth left out towards the sea (7) - {CO}{A}{STAL(-l)}
15 - Roof of the orange coloured room (7) - ?E?A?O?
17 - Can a notice be put up in the country? (6) - {CAN}{A}{DA<-} )
19 - A messenger is before the supporter of an actor (7) - {A}{BRA}{HAM}
20 - Old king has left the waste matter (5) - {OFFA}{L}
21 - Large quantity of tapes are out (5) - SPATE*
GRID

