Crossword Genius

Food wagon overlooking near side of road (4)

Ross

I believe the answer is:

tuck

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'food' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tuck that I've seen before include "Schoolboy grub like sweets and cakes" , "Friar of Sherwood" , "Food for schoolboys" , "Stitched fold in garment" , "Dart" .)

I've seen this clue in The Telegraph.
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