Crossword Genius

Have something in common with friend, literally? (7)

Ross

I believe the answer is:

overlap

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'have something in common' 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 overlap that I've seen before include "Extend beyond edge of a thing and partly cover it" , "Partly cover (another object)" , "Partly cover - a plover (anag)" , "Extend on top of" , "Partly coincide in time, length etc" .)

I've seen this clue in The Telegraph.
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