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Piece of evidence solvers are familiar with (4)

Ross

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This clue could be a double definition.

'piece of evidence' is the first definition.
(I've seen this before)

'solvers are familiar with' is the second definition.
I know that 'solvers' relates to this answer.

Can you help me to learn more?

(Other definitions for clue that I've seen before include "Crossword item" , "Hint; piece of evidence" , "contribution to crossword" , "It helps solve a crime" , "Hint to get what this is?" .)

I've seen this clue in The Telegraph.
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