Ring lecturer to register unknown branch of dentistry (10)
I believe the answer is:
odontology
'branch of dentistry' is the definition.
(study of diseases of the teeth)
'ring lecturer to register unknown' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'lecturer' becomes 'don' (don can mean an academic).
'register' becomes 'log' (I've seen this before).
'unknown' becomes 'y' (algebra).
'o'+'don'+'to'+'log'+'y'='ODONTOLOGY'
(Another definition for odontology that I've seen is " Scientific study of teeth".)
I've seen this clue in The Times.
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