Publicity materials using laddism from time to time (3)

I believe the answer is:

ads

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'publicity' is the definition.
(advert)

'laddism from time to time' is the wordplay.
'from time to time' means one should take alternating letters (letters removed on a regular basis).
The alternating letters of 'laddism' are 'ADS'.

'materials using' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for ads that I've seen before include "Commercials" , "Promotions" , "Classifieds (abbr)" , "Notices" .)

I've seen this clue in The Times.

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