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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 can't understand how they can define each other.

'for take-off' is the wordplay.
I cannot quite see how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for unbutton that I've seen before include "Undo clothing" , "Undo fastening" , "Become less inhibited" .)

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