Top students learn everything at the last minute then take a hike (5)

I believe the answer is:

scram

I'm a little stuck... Click here to teach me more about this clue!

'take a hike' is the definition.
'scram' can be an answer for 'take' (thesaurus). I am not sure about the 'a hike' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for scram that I've seen before include "make emergency shut-down" , "Make oneself scarce" , "Go away quickly" , "Slangy order to go away, beat it" , "Vamoose" .)

I've seen this clue in the Sydney Morning Herald.

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