THEME: people who may be considered "swingers"
GOOD ONES: Important word for {theme} SWING
Body part that smells NOSE [surprised this clue passed the "breakfast test"]
Not at all well-done RARE
Bulletin board material CORK [I thought info.]
Feathery layer HEN
Forest floor flora FERN [how's that for onomatopoeia! Reminds me of Walter de la Mare's "The Listeners"]
BTW: Like cough syrup ORAL [not really --- it's taken orally; the medicine itself is not oral, meaning
related to the mouth]
PETRI is off-the-wall hard for a Wednesday (and for me

); but it didn't have to be. It took five minutes, less, to avoid the name:
Change PETRI to
DOUBT; SWING to
SESTA; and AFT to
ODS [OD's means overdoses]
Thus ANTI becomes
ONUS, FERN becomes
DEBT, and TRIG becomes
SRTA [senorita title address]
RATING:

Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun