Flipping inane, dull advertiser screens advert (6)
I believe the answer is:
allude
'advert' is the definition.
(I've seen this in another clue)
'flipping inane dull advertiser screens' is the wordplay.
'flipping' says the letters should be written backwards.
'screens' indicates a hidden word.
'edulla' can be found hidden inside 'inane dull advertiser'.
'edulla' in reverse letter order is 'ALLUDE'.
(Other definitions for allude that I've seen before include "Refer briefly or indirectly in speaking" , "Mention in passing" , "Make vague reference to" , "give a reference" , "Make reference to, perhaps indirectly" .)