Crossword Genius

Ore investigator like Leo? (7)

Ross

I believe the answer is:

assayer

'ore investigator' is the definition.
(someone who tests minerals)

'like leo?' is the wordplay.
'like' becomes 'as'.
'leo?' becomes 'Sayer' (Leo Sayer, the English-Australian singer).
'as'+'sayer'='ASSAYER'

(Other definitions for assayer that I've seen before include "Tester of chemicals on metal" , "One analyses metals" , "(Precious metal) analyst" , "He allocates marks" , "One does chemical tests on metals" .)

I've seen this clue in the Sydney Morning Herald.
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