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2dn,'One in polluted environment falling over - that's rash'(8), E-I----N; 26ac,'Shame! Not wholly keen to take in learner for instruction' (8),T----A-E.Tutelage?
21dn,'Cardinal points in tiny change'(6),N-N---. Ninety?
12ac,'Container of medicine that's essential to drop temperature'(4),---L. Pill?
Can't break through with these. Have done the rest.

eruption,vial others ok

Tut = shame (tut tut)
eage(r)
12a Vial (vital)

eruption = not pure reversed. insert i

Thanks all. I had made a mistake, now corrected, with 10ac, which obstructed 'eruption'.