Drive off though said to go on foot (4)

I believe the answer is:

shoo

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'drive off' is the definition.
(shoo can mean to drive off or send away)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for shoo that I've seen before include "Drive away" , "Sling your hook!" , "Dismissive remark" , "Exclamation used to chase away animals" , "Expression to chase away an animal" .)

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

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