Roaming has transformed crime writer (5,5)

I believe the answer is:

ngaio marsh

'crime writer' is the definition.

'roaming has transformed' is the wordplay.
'transformed' is an anagram indicator.
'roaming'+'has'='roaminghas'
'roaminghas' with letters rearranged gives 'NGAIO MARSH'.

I've seen this clue in The Daily Express.

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