21a genus of old red sandstone fish-like creatures with wing-like appendages. 36d In law, to preclude by a rule of evidence disallowing denial of a previous assertion. Many thanks in advance.
Stuck today - 27a a millet, eleusine coracana much grown in India, Africa etc 36a any of a group of alcohols which are waxy insoluble surfaces 37d a variety of wheat triticum dicoccum grown in...