Envelope.
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A teapot contains tea. The word teapot begins and ends with the letter t.
Envelope begins and ends with the letter e. It contains one letter.
Tarantella is a 10 letter word. It begins with the letter T and ends with the letter A.
A word that begins and ends with E and has only 1 letter in between is EYE. Begins and ends with E and the Y is in between.
If the question means 'one other letter', I believe the answer is eye. (Adds one letter Y.) If the question is a riddle, the answer is 'envelope' as it begins and ends with 'e', and it contains a letter.