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Help please, probably got something wrong??!!
9a. Very well known (9) ?o????h??d
3d, Knockout (7) ??u?c?y
Quick solve doesn't come up with any logical answers..

9, you are showing 10 characters.
How many is it?

You are showing 10 letters. Could it be household (as in household name- very well known) which fits the letters?

Rusty and ab
Sorry for delay in replying, got waylaid.
Sorry too for error in letters, 1a not 9a does have 9 letters. ab, Household, fits and makes sense, thank you. 3d therefore begins with 's' and 'stupify' fits. This makes the 'c' wrong with letters I gave.
Finally 12a. IT pairing system (9) bl?i?o?t?

12 Bluetooth

3 Stupefy

stupEfy

Mamaya and sudokulover.
Stuped me! Thank you both very much, Bluetooth, of course.

Harald Bluetooth was a 10th century Danish king, apparently!

Rusty
Thank you so much for that, l love to learn new things. Bluetooth doesn't sound Danish so will find out, thanks to you....