Brit Xword

I haven't put up one of these for a while, and this one has a theme:

-1. Awfully glum around old 2, perhaps (5)

-2. Advert that is plugged by broadcasting tycoon (11)

-3. 2 to live north of Australia, turning south (5)

-4. 2 with desert rodent (7)

-5. Casual work of 2 on rum (3,4)

-6. Time after meal for 2 (7)

-7. Publication listing 2s, targeted at elite, mostly (6)

-8. Perhaps 2s from North America with old money (6)

-9. Unknown fool losing head with composer that's a 2 (10)

-10. Ticks off Conservative 2 drinking wine (10)

-11. Boy about to limit 2's bid (2,6)

12. 2 holding up flag for novelist (4,7) I... ....... - definition on right (this was a down clue)

As usual, being all heart, I am giving you the first and last letters in alphabetical order HI (with any luck these may even be correct...)

Feel free to grab a couple as there are probably more than enough to go round among the crossword fans.

Okay, I'll be the 1st and try ......

9. Zuckerberg - Z(unknown) + (s)ucker(fool losing head) + Berg(composer)

2. billionaire
bill (advert) i[onair]e ie around (plugged by) on air (broadcasting)

1. Mogul (anagram of 'glum' around 'o' for old) - Nice puzzle Lex

Bernie

We're up and running, and of course now you have the key.

6. Buffett

7. Forbes - for (targeted at) + bes(t) (elite, mostly)

Two more bite the dust, but Elon, Jeff, Steve, Bill, Donald and Rupert are all still waiting to be found...

If the letter count for #5 is really 3,4 I would wager the answer is ODD JOBS

Cheryl, you would win that bet!

Apologies for the dodgy letter count

...I have checked the others and added first letter hints

4. Muskrat??

10. castigates
C(conservative) + Asti(wine) + Gates

Thank you: two more good answers

3. Be (live) zo (OZ for Australia, turning) s (south) Bezos

There goes Jeff!

11. no trumps

You're on a roll, Remi!

8. nabobs

Correct young lady, so now it's just Rupert's namesake the novelist...

Okay, that last one is Iris Murdoch.