What does the cryptic crossword clue "Poster plugging good show is boasting (7)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Poster plugging good show is boasting (7)

Guardian Cryptic #26826 | 19 Across | 2016-03-08 flower

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