Mayhem Parva By Vagans

[Matakari]

Villainy is afoot once again in an English village. Extra letters given by the wordplay of down clues (not to be entered) spell out a hint which can help identify the serial protagonist (and avoid two red herrings linked to the location). Solvers should highlight the name of the village (12) and the person responsible for the events (6) (17 cells in all). Chambers is recommended.

Good morning, I’m stuck on many of the down clues for which I would appreciate answers, thanks. Vagans is new to me and seems quite tricky, especially with the extra letters which always give me trouble.
DOWN:
3 Black raider in disguise shoots north of Border (6): ?R?CR?
4 Alien has head covered with sheepskin for helmet (6): ?A?HE?
5 Sort of acid bloke with microphone (6): ???S??
7 State rules on new beard (3) : ??I
8 Tags eaglets circling heart of shire (7): ??ML???
11 Punish youths (they can hold knives in their drawers) (8): ??UT?E?P
25 African-American man re-organised Arbroath when Rector away (6):????H?
26 Swan tore up old quill-case (6):????E?

[Tilly2]

26 quiver ?

[Tilly2]

25 brother

[Tilly2]

6 formic?

[JJ109]

11 Canteens (extra letter was e ----can(e) teens)

[JJ109]

8. Ligates anagram eaglets + (sh)i(re) - extra letter E

[Matakari]

Thanks,Tilly2, but 25d comprises six letters only. And where does 6 Formic come from?

[JJ109]

5 Bro mic

[JJ109]

5 forget bromic - forgot the extra letter?

[JJ109]

7 AWN
Law (state rules) + N(new) = Lawn - extra letter L = AWN (beard on a corncob)

[Matakari]

Thanks, JJ109, I'm staring at the others!

[ProfessorMaisie]

3 BRAIRD [e] from B + anag 'raid[e]r' [e extra]
4 BASNET - ET in BAS[a]N = 'sheepskin' [a extra]
5 MALEIC - MALE + [m]IC [m extra]
8 AIGLETS anag [e]aglets + i
25 BROTHA 'a(r)bro[a]th' anag [extra a] the 'r' is lost in wordplay
26 PEN + REN[t] (reversed) = PENNER [t extra].

[Tilly2]

I'll give this a miss next time! :-)

[Matakari]

Thanks, ProfessorMaisie! I will not give up on this one till
I've tried a bit more!