10 across
Crete:
nice,
surprisingly
–
that’s
not
saying
much
(9)
Crete: nice, surprisingly – that’s not saying much (9)
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The definition is at the end of the clue.
How the clue works
Look at that's not saying much at the end — that's your definition, pointing to something reserved or uncommunicative. Take the letters of Crete and nice and jumble them up ("surprisingly" is your anagram indicator), and they rearrange neatly into RETICENCE.