Times Cryptic 28,050

[NeilMunro]

Very grateful for all help with these clues please.
13dn: “Caller copying Doctor Celsius mixed big drink (11).”
15ac: “Slow to see accident as British capital drawn into fight (10).”
21dn: “Democrat leaving republic, extremely upset, sees anarchy (5).”
27ac: “Back trouble unknown in diminutive Jedi master (4).”

[Lie-in King]

13d Mockingbird - 'MO (doctor) C(elsius)' + anag 'big drink'
15a Rubberneck - 'B(ritish) Berne' (in) 'ruck'
21d Chaos - 'Cha(d)' ('D[emocrat]' leaving) + 'so' (extremely, upset)
27a Yoda - 'ado (trouble) y (unknown)' (all back)

[NeilMunro]

Many thanks!!!