Crossword Genius

Detailed bill and letter from overseas (3)

Ross

I believe the answer is:

chi

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'letter from overseas' is the definition.
I can't tell whether this defines the answer.

'detailed bill' is the wordplay.
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'bill' becomes 'chit' (chit is a kind of bill).
'chit' with its final letter taken away is 'CHI'.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for chi that I've seen before include "Letter written by European", "T'ai -, martial art", "Mental projection", "Chinese life-force", "character from Euripides?".)

I've seen this clue in The Telegraph.
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