Solvers! Thanks for giving my puzzle a go. Your feedback is always very welcome, so I hope you'll let me know how you got on
Here's the wash-up:
ACROSS.
1A. "first shown" = S, "flapper" = WING.5A. Barbie's valentines are addressed TO KEN.6A. "Crop" = BEET around last letter of "farmer".7A. anag. "good" = G + YARN.
DOWN.
2D. Hidden in "tWO VENetian".3D. "Republican" = R, after "new" = N, "first lady" = EVE.4D. Reversal (turns up) of "pungent smell" = TANG.5D. Homophone of "yours truly" = TUBER.