Crossword Genius

Lead-in to "calculus" (3)

Ross

I believe the answer is:

pre

'lead-in to calculus' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for pre that I've seen before include "Before starting" , "Before or ahead of" , "Combining form meaning before" , "Before, prior to" , "Prefix meaning before" .)

I've seen this clue in the Universal.
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