Enter a clue or pattern or both:
The Clue
Sale notices, for short (3 letter answer)
The Answer
ADS
Tags
Notes
The answer ADS is very common and appears about once every 48 puzzles.
Related Clues
Commercials
Infomercials
Promos
Circular staples
Classified items
Come-ons
Google moneymakers
Marketing tools
Radio plugs
Come-ons of a sort
Consumer Reports lack
Job listings, e.g.
"Mad Men" output
Madison Ave. output
Madison Ave. products
Madison Avenue offerings
PBS no-no
PC pop-ups
Side jobs for actors
Source of TV revenue
They push things
TV ... want ... clutter
Web site clutter
Most junk mail, essentially
Some pitches at baseball stadiums
Some Super Bowl Sunday highlights
TiVo users may skip them
Definition
AD as a noun:
1. (ad, advertisement, advertizement, advertising, advertizing, advert) = a public promotion of some product or service