Crossword Genius

First phase of the Stone Age (5,3)

Ross

I believe the answer is:

stage one

'first phase' is the definition.
(I've seen this in another clue)

'of the stone age' is the wordplay.
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'stone'+'age'='stoneage'
'stoneage' is an anagram of 'STAGE ONE'.

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