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Is it used when lying low? (11)

Ross

I believe the answer is:

groundsheet

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'low?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps 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 groundsheet that I've seen before include "protective cover" , "campers need it" , "Waterproof base for tent" , "something for campers" , "What keeps a tent dry" .)

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