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my post crossed....too late typing answer

I put IMPROVIDENCE at 26a. Seemed to fit - pro for expert etc. Fiendish! Now stuck on 21a and 22d

21a: Strait = channel (def)
s- singular
trait - quality

22d: twang = distinctive tone
tang - sharpness
w- weight

26a: extravagance = wastefulness (def)
extra - further
v - volume
ace - expert
nag - worry (reversed)