Phone assistant, American star (6)

I believe the answer is:

sirius

'star' is the definition.
(Sirius is an example)

'phone assistant american' is the wordplay.
'phone assistant' becomes 'siri' (iPhone voice assistant).
'american' becomes 'us' (abbreviation for United States).
'siri'+'us'='SIRIUS'

(Other definitions for sirius that I've seen before include "The Dogstar" , "Brightest star in the sky" , "The Dog Star that follows the hunter Orion" , "The Dog Star, brightest of the fixed stars" , "Prominent star" .)

I've seen this clue in The Times.

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