Isolated younger rocks form our islet (8)
I believe the answer is:
outliers
'isolated younger rocks' is the definition.
(geological term)
'form our islet' is the wordplay.
'form' indicates an anagram.
'our'+'islet'='ourislet'
'ourislet' anagrammed gives 'OUTLIERS'.
I've seen this clue in The Guardian.
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