Puzzles nan, for starters, with senseless ageism (7)

I believe the answer is:

enigmas

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'puzzles' is the definition.
(an enigma is a puzzle or mystery)

I can't explain the rest of the clue.

(Other definitions for enigmas that I've seen before include "'Puzzles, riddles (7)'" , "They're mysterious or difficult to understand" , "Puzzles - mysteries" , "'Mysteries, riddles (7)'" , "Problems" .)

I've seen this clue in The Irish Times.

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