Crossword Genius

Piece of designated evidence? (4)

Ross

I believe the answer is:

sign

'evidence?' is the definition.
(sign is a kind of evidence)

'piece of designated' is the wordplay.
'piece of' indicates a hidden word.
'SIGN' is hidden in the letters of 'designated'.

(Other definitions for sign that I've seen before include "Public notice; portent" , "Show" , "Put one's name to a document" , "Communicate to the deaf" , "add name" .)

I've seen this clue in the Evening Standard.
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