I was introduced to American after seizing power (7)

I believe the answer is:

impetus

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'i was introduced to american after seizing power' is the definition.
I can't judge whether this definition defines the answer.

'i was introduced to american after seizing power' is the wordplay.
'was introduced to' becomes 'met'.
'american' becomes 'us' (abbreviation for United States).
'after seizing' indicates putting letters inside.
'power' becomes 'p'.
'met'+'us'='metus'
'metus' going around 'p' is 'mpetus'.
'i'+'mpetus'='IMPETUS'

Can you help me to learn more?

(Other definitions for impetus that I've seen before include "Motivation" , "Driving force, forward movement" , "Drive" , "Imputes to force with which a body moves" , "Catalyst" .)

I've seen this clue in The Telegraph.

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