German tenets about decrease in affection (12)

I believe the answer is:

estrangement

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'decrease in affection' is the definition.
The definition and answer can be both feelings as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'german tenets about' is the wordplay.
'about' indicates anagramming the letters.
'german'+'tenets'='germantenets'
'germantenets' anagrammed gives 'ESTRANGEMENT'.

Can you help me to learn more?

(Other definitions for estrangement that I've seen before include "Alienation" , "division" , "Result of splitting up" , "lack of good relationship" .)

I've seen this clue in The Irish Independent.

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