Publicity features in broadsheets (3)
I believe the answer is:
ads
'publicity' is the definition.
(advert)
'features in broadsheets' is the wordplay.
'features in' indicates the answer is hidden within the clue (I've seen 'featured in' mean this).
'ADS' is hidden within 'broadsheets'.
(Other definitions for ads that I've seen before include "Commercials" , "Promotions" , "Classifieds (abbr)" , "Notices" .)