Crossword Genius

Problem in a gem being reset (6)

Ross

I believe the answer is:

enigma

'problem' is the definition.
(enigma is a kind of problem)

'in a gem being reset' is the wordplay.
'being reset' indicates an anagram.
'in'+'a'+'gem'='inagem'
'inagem' is an anagram of 'ENIGMA'.

(Other definitions for enigma that I've seen before include "It's mysterious like gamine" , "Gamine being a bit of a puzzle" , "'Puzzle, riddle (6)'" , "'Mystery, riddle (6)'" , "Puzzle of gamine (6)," .)

I've seen this clue in The Times.
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