Crossword Genius

Puzzle that's full of holes? (6)

Ross

I believe the answer is:

riddle

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'puzzle' is the definition.
(a riddle is a puzzle or problem)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for riddle that I've seen before include "mystery" , "unsolved problem" , "It may have an answer" , "Run through" , "Difficult problem or coarse sieve" .)

I've seen this clue in The Sun.
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