Crossword Genius

Can be ridden, though one may go on foot (4)

Ross

I believe the answer is:

mule

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'can' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mule that I've seen before include "Obstinate person?" , "Drug courier; animal" , "Hybrid animal - slipper" , "Crossbreed" , "Drug smuggler" .)

I've seen this clue in the Evening Standard.
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