23 down
Ask
Einstein
to
include
networks
(6)
Ask Einstein to include networks (6)
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The definition is at the end of the clue.
How the clue works
Have a look at "aSK EINStein" — "include" is telling you the answer's hiding right there inside those letters. Whip it out and you get a word meaning networks, like tangled coils or skeins.