Crossword Genius

Cleared for takeoff, launched attack (3,3)

Ross

I believe the answer is:

let fly

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'attack' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for let fly that I've seen before include "Fling" , "Attack; throw" , "Launch an attack on someone, verbally" , "Release pent-up anger" , "Attack verbally or physically" .)

I've seen this clue in The Guardian.
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