Crossword Genius

Mimic a departure (7)

Ross

I believe the answer is:

takeoff

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This could be a double definition.

'mimic' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'a departure' is the second definition.
(I know that takeoff is a type of departure)

Can you help me to learn more?

(Other definitions for takeoff that I've seen before include "do impersonation" , "Launch" , "Get up" .)

I've seen this clue in The Daily Express.
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