Q: The challenge is to find a chain of 'C' words to connect 'carbon' to 'circuit.' Each pair of words completes a compound word or familiar two-word phrase (e.g. CASH COW or CREDIT CARD). Will's chain has seven words between 'carbon' and 'circuit' for a total of nine words. The answer doesn't have to match Will's, but each word has to start with 'C,' and each has to combine with the words before and after to make a compound word or familiar two-word phrase.You can work this forward and/or backward; I did both. In retrospect I shouldn't have had so much trouble finding the joining word in the middle. It's hard to give clues without revealing the answer. I'll just say I'm pretty sure I have the same list as Will.
Edit: The hint above referred to the middle word in the chain which coincidentally was "center".
A: CARBON - COPY - CAT - CALL - CENTER - COURT - CASE - CLOSED - CIRCUIT