Scottish Field

[johnT]

A couple more I'm not sure about

12a. Nasty weapon (5) M?L?Y
(I have MALKY as a term for being slashed, chibbed (or headbutted), so assuming a razor might be a MALKY?)
20d. Twelve inches (3) ???
(I have TAE as a Scottish term for a foot is TAE apparently).
24a. Go. A row in knitting (4) ????
(I have GANG as I believe its a term for leaving, and a Shetland knitting term for a row in knitting).

Not come across most of these, any help?

[Lie-in King]

Wiki gives - "Malky/Malkie, slang term originating from Glasgow and the West coast of Scotland, used to describe slashing someone with an open razor. Comes from the rhyming slang Malcolm (Malky) Fraser (Razor)"

[Lie-in King]

24a Looks ok

[Lie-in King]

20d Fit (?)

fit [fɪt, NN. I. fit]
n. A foot, a unit of measurement

https://scots-online.org/dictionary/english_scots.php