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Prepare for take-off? (8)

Ross

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8

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'prepare' is the definition.
Although both the answer and definition are verbs in their base form, I cannot see how they can define each other.

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(Other definitions for unfasten that I've seen before include "Unlock" , "tie? No" , "Nun's fate (anag.)" , "Loosen or open, say seatbelt" , "Let go" .)

I've seen this clue in The Globe and Mail.
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