Investigators clumsily test device (10)
I believe the answer is:
detectives
'investigators' is the definition.
('detective' can be a synonym of 'investigator')
'clumsily test device' is the wordplay.
'clumsily' is an anagram indicator.
'test'+'device'='testdevice'
'testdevice' is an anagram of 'DETECTIVES'.
I've seen this clue in the Sydney Morning Herald.
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