Born after the war like Joey (4,6)

I believe the answer is:

baby boomer

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

I don't understand the rest of the clue.

(Other definitions for baby boomer that I've seen before include "Joey" , "One of many born after WW2" , "born just after the war?" , "one arriving in a crowd" , "Someone born in the decade after WWII" .)

I've seen this clue in the Sydney Morning Herald.

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