What does the cryptic crossword clue "Knock in vain with dispatch (7)" mean?

The definition is "Knock". The wordplay uses a charade (building blocks). RAP (synonym of "Knock") + IDLY (synonym of "in vain"); definition: "with dispatch" The answer is RAPIDLY.

Knock in vain with dispatch (7)

Guardian Cryptic #27556 | 11 Across | 2018-07-09 flower

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