Crossword Genius

Puzzle producing strain (6)

Ross

I believe the answer is:

riddle

This clue is a double definition.

'puzzle' is the first definition.
(riddling is a kind of puzzling)

'strain' is the second definition.
(riddling is a kind of straining)

'producing' is the link.

(Other definitions for riddle that I've seen before include "Perforate with gunshot - poser" , "Difficult problem or coarse sieve" , "The large sieve is a puzzle" , "Gradual assimilation of ideas or knowledge" , "Eg, When is a door not a door?" .)

I've seen this clue in The Telegraph.
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