Quaint measure deducted on another in a bit of calculus (9)
I believe the answer is:
gallstone
'calculus' is the definition.
(I know that gallstone is a type of calculus)
'quaint measure deducted on another in a bit' is the wordplay.
I cannot really see how this works, but
'measure' could be 'stone' (stone is a kind of measure) and 'stone' is located in the answer.
'a' is present in the answer.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for gallstone that I've seen before include "Let Anglos suffer with small hard mass in body" , "It's removed in hospital" , "Small hard secretion formed in the body" , "Concretion of cholesterol, lime salts, etc" , "Problem for bile ducts" .)