Crossword Genius

Calculus vexes tenor (9)

Ross

I believe the answer is:

gallstone

'calculus' is the definition.
(gallstone is a kind of calculus)

'vexes tenor' is the wordplay.
'vexes' becomes 'galls' (I've seen this in another clue).
'tenor' becomes 'tone' (synonyms).
'galls'+'tone'='GALLSTONE'

(Other definitions for gallstone that I've seen before include "Concretion of cholesterol, lime salts, etc" , "Problem for bile ducts" , "Small hard secretion formed in the body" , "It's removed in hospital" , "Let Anglos suffer with small hard mass in body" .)

I've seen this clue in The Times.
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