Puzzle strain (6)

I believe the answer is:

riddle

I believe this clue is a double definition.

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

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

(Other definitions for riddle that I've seen before include "Kind of puzzle or coarse sieve" , "Run through" , "Sieve; enigma" , "Sphinx's conundrum?" , "Sieve or conundrum" .)

I've seen this clue in The Telegraph and The Guardian.

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