What does the cryptic crossword clue "Broadcaster interrupted by white flash (6)" mean?

The definition is "flash". The wordplay uses a charade (building blocks). SWANKY (synonym of "Broadcaster interrupted by white"); definition: "flash" The answer is SWANKY.

Broadcaster interrupted by white flash (6)

Guardian Cryptic #26906 | 26 Across | 2016-06-09 flower

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