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1 Across, Processing for Labs to do in criminal evidence (10)

10 Across, Native American in California cheers midlands side (7)

11 Across, Put up with northern runner's attitude (7)

12 Across, Controversial karate instructor against entering competition
(9)

Compiler - TEES

Many Thanks

{Hopefully no mistakes this time!}

1a: bloodstain = criminal evidence (def)
anagram of "labs to do in"

10a: Catawba - Native American (def)
Ca- California
Ta - Cheers
WBA - West Bromwich Albion (Midlands football team)

11a: posture = attitude (def)
post- put up
Ure = Northern river


Sorry, I cannot see 12 at the moment!

10 Catawba

12 sensitive - controversial in the legal sense
sensi - karate instructor
v - against
tie - in competition

Catawba is a Californian grape variety

and also

https://www.merriam-webster.com/dictionary/Catawba

Good morning to you both and many thanks.

Glad I could help, John.