Mature folk left in a flurry of dust (6)

I believe the answer is:

adults

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'mature folk left in a flurry of dust' is the definition.
I can't tell whether this defines the answer.

'left in a flurry of dust' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' is an insertion indicator.
'flurry of' indicates an anagram (I've seen 'flurried' mean this).
'dust' anagrammed gives '[dust]'.
'a'+'[dust]'='a[dust]'
'l' placed inside 'aduts' is 'ADULTS'.

Can you help me to learn more?

(Other definitions for adults that I've seen before include "Grown-upss" , "Mature or fully-grown people" , "Fully developed animals" , "Grown-ups, mature people" , "Mature 25 down" .)

I've seen this clue in The Globe and Mail.

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