Crossword Genius

A sentence that can be made longer (7)

Ross

I believe the answer is:

stretch

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'a sentence' is the definition.
(a stretch in prison)

I don't understand the rest of the clue.

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(Other definitions for stretch that I've seen before include "that will make a bigger man of you?" , "Increase" , "Exaggerate" , "Make to go further" , "Do warm-up exercises" .)

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