Crossword Genius

Original form of tyre containing carbon (7)


I believe the answer is:


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'original form' is the definition.
'radical' can be an answer for 'form' (radical is a kind of form). I'm not sure about the 'original' bit.

'tyre containing carbon' is the wordplay.
'tyre' becomes 'radial' (radial is a kind of tyre).
'containing' means one lot of letters goes inside another.
'carbon' becomes 'C' (chemical symbol).
'radial' going around 'c' is 'RADICAL'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for radical that I've seen before include "Drastic or thorough as changes may be" , "leftist?" , "Thoroughgoing - (popularly) extremist" , "Basic" , "Fundamental - thoroughgoing" .)

I've seen this clue in The Independent.
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