Crossword Genius

Cart infested with insects (5)

Ross

I believe the answer is:

buggy

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'cart' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for buggy that I've seen before include "Light horse-drawn vehicle; infested" , "Of software, containing errors" , "Pushchair - small motorised vehicle" , "Vehicle for baby, golfer or moon explorer" , "A small vehicle as for baby" .)

I've seen this clue in The Telegraph.
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