Sat. Times 24634

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Stuck on the last 3.
26ac. Fit cases for, ultimately , debate.(5) ????E.
16dn. Knight visiting capitals entered without obstruction (9)U?C?O???D
25dn. Girl's last letter found on a drawer.(4)???A
Answers and explanations would be helpful.

[kayakamina]

26 A r gue

16 U nclogged

25 Z a RA

[kayakamina]

I note you asked for explanations-
26a R (for ultimately) in AGUE (fit)

16d N (Knight) UC (Upper case) LOGGED (entered)

25 Z (last letter) A RA (artist/drawer)

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Many thanks super answer