2dn,'Getting through half a century is massive', S-I-M-C. Why seismic?
11ac,'Bank getting the general idea?',--I-T. Drift?
29ac,'The way spinet may be deconstructed cryptically',-T-E-T. Street?
6dn,'Execute more psychotic poisoner',A---R.
Adder? Done otherwise,but a touch tricky.