Endlessly bitter about disputed land (5)

I believe the answer is:

tibet

I'm a little stuck... Click here to teach me more about this clue!

'disputed land' is the definition.
'tibet' can be an answer for 'land' (Tibet is an example). I am unsure of the 'disputed' bit.

'endlessly bitter about' is the wordplay.
'endlessly' means to remove the last letter.
'about' is an anagram indicator.
'bitter' with its last letter removed is 'bitte'.
'bitte' anagrammed gives 'TIBET'.

Can you help me to learn more?

(Other definitions for tibet that I've seen before include "Home country of the Dalai Lama (5)" , "Autonomous region of China, capital Lhasa" , "Part of Asia" , "Mountainous Asian region" , "Nepal''s neighbour" .)

I've seen this clue in The Independent.

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