Journey using free energy (4)

I believe the answer is:

ride

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'journey' is the definition.
(I know that ride is a kind of journey)

I can't explain the rest of the clue.

(Other definitions for ride that I've seen before include "A dire sort of journey" , "Travel, on horseback, say" , "What suckers are taken for" , "Travel by horse, bus, etc" , "Travel on the back of animal" .)

I've seen this clue in The Sun.

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