17 down
Riddle
from
Sphinx’s
first
teacher
(8)
Riddle from Sphinx’s first teacher (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Riddle — as in a coarse sieve, which is exactly what a strainer is. For the wordplay, take S (the first letter of "Sphinx") and add trainer (a teacher) to get your answer.