Rt35

[DavidLC]

10a. Sound a plentiful source (4) -E-L. is it well?
19d. You begin to experience lift if unsteady (5) -O-K-. is it rocky?
Thanks.

[Lie-in King]

10a Yes, 'Well' - sound; fit; healthy
19d Wonky - 'y(ou) know' (lifted; up)

[aelmpvw]

well, double meaning

[dannyk13]

10a Yes, double meaning

[DavidLC]

Much Obliged....

[Hypognosis]

Somehow, I only just noticed that the relatively recent slang term "wonk" might have been deried from "someone who [know]s everything backwards".

:o)