Crossword Genius

Cohort that gets on together (3,5)

Ross

I believe the answer is:

age group

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'cohort' is the definition.
(I've seen this before)

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

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(Other definitions for age group that I've seen before include "teenagers?" , "Cohort" , "Old folk maybe" , "Demographic bracket" , "People of the same generation" .)

I've seen this clue in The Guardian.
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