Crossword Genius

A screen mystery (6)

Ross

I believe the answer is:

riddle

This clue is a double definition.

'a screen' is the first definition.
(I know that riddle is a type of screen)

'mystery' is the second definition.
(I've seen this before)

(Other definitions for riddle that I've seen before include "Run through" , "Kind of puzzle or coarse sieve" , "sort out" , "it's full of holes" , "Gradual assimilation of ideas or knowledge" .)

I've seen this clue in the Evening Standard.
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