An untruth twisted at end, caused estrangement (9)

I believe the answer is:

alienated

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'caused estrangement' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how one could define the other.

'an untruth twisted at end' is the wordplay.
'an' becomes 'a'.
'untruth' becomes 'lie' (lie is a kind of untruth).
'twisted' indicates anagramming the letters.
'at'+'end'='atend'
'atend' anagrammed gives 'nated'.
'a'+'lie'+'nated'='ALIENATED'

Can you help me to learn more?

(Other definitions for alienated that I've seen before include "put off" , "disaffected" , "Date Liane (anag.)" , "divorced" , "Estranged" .)

I've seen this clue in The Irish News.

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