Crossword Genius

Block piece of publicity (4)

Ross

I believe the answer is:

plug

This clue is a double definition.

'block' is the first definition.
(I know that plug is a type of bung)

'piece of publicity' is the second definition.
(I've seen this before)

(Other definitions for plug that I've seen before include "See 19" , "Stop - advertising" , "quid" , "Good word" , "Stopper - advertisement" .)

I've seen this clue in The Telegraph.
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