Wish to travel? Minimal cost when cycling (5,4)

I believe the answer is:

itchy feet

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But I can't explain it at all! Could you help me understand?

(Other definitions for itchy feet that I've seen before include "reason for leaving?" , "Strong desire to travel" , "They show a strong urge to travel" , "Restlessness, a desire to travel - or scratch?" , "Those with these have a strong impulse to travel" .)

I've seen this clue in The Guardian.

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