Adoption of wavering pose by America's left... (8)

I believe the answer is:

espousal

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'adoption' is the definition.
(thesaurus)

'wavering pose by america's left' is the wordplay.
'wavering' is an anagram indicator.
'by america' becomes 'usa' ('U.S.A.' can be a synonym of 'america'. I am not sure about the 'by' bit.**).
'left' becomes 'l' (common abbreviation).
'pose' anagrammed gives 'espo'.
'espo'+'usa'+'l'='ESPOUSAL'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for espousal that I've seen before include "championship" , "old-fashioned marriage" , "Backing, support" , "Acceptance with approval" , "Adoption, support (of)" .)

I've seen this clue in The Telegraph.

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