Pose as an American (5)

I believe the answer is:

asana

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'pose' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'as an american' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'as'+'an'+'a'='ASANA'

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(Other definitions for asana that I've seen before include "Yoga position" , "Yoga posture" , "Spiritual position" , "meditative posture" .)

I've seen this clue in The Independent.

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