Unequal readings of caesium and uranium give you pause (7)

I believe the answer is:

caesura

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'pause' is the definition.
(I know that caesura is a type of pause)

I don't understand how the remainder of the clue works.

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(Other definitions for caesura that I've seen before include "Pause near middle of verse line" , "Short pause in a line of verse" , "Pause or interruption (in conversation or prose)" , "Break in line" .)

I've seen this clue in The Independent.

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