I'm striking an attitude that's impressive (8)

I believe the answer is:

imposing

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'impressive' is the definition.
(similar in meaning)

'i'm striking an attitude' is the wordplay.
'striking an attitude' becomes 'posing' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'im'+'posing'='IMPOSING'

'that's' acts as a link.

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(Other definitions for imposing that I've seen before include "Impressive in appearance" , "Enormous - levying - striking" , "Grand, impressive" , "Dictating; impressive" , "Taking liberties" .)

I've seen this clue in the Evening Standard.

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