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thanks for all helpers; settled for 'YARN for 20down. 'DOUBLE UP' for 12 down. 'round off' for 24 across.
This leaves only 3 to complete! 15across; 'VENEER,PRETEXT, -U---
19 across; WITHOUT SOLIDITY, -L---Y (flimsy,soppy????)
16 down; ONLY, MERELY, ----L- (solely,simply, singly????)
correct answer to 15across will decide first letter to 16down and then 4th letter of 19across!