11 May - Solution for the last clue and the next cryptic crossword clue

Flag master unfurled round about (8)

Solution – streamer

Here an anagram of "master" (ie it is "unfurled") is round "re" standing for "about".  And a streamer is a sort of flag.

Today’s cryptic crossword clue – solution tomorrow

Campaigner more offensive about Salvation Army (8)

Hint – this is a container clue