Smiling, I claim to be exploited (6)

I believe the answer is:

amused

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'smiling i claim to' is the definition.
I can't judge whether this definition defines the answer.

'be exploited' is the wordplay.
'be' becomes 'am'.
'exploited' becomes 'used' (synonyms).
'am'+'used'='AMUSED'

Can you help me to learn more?

(Other definitions for amused that I've seen before include "was entertaining" , "Medusa (anag)" , "Queen Victoria wasn't!" , "Delighted" , "Tickled pink" .)

I've seen this clue in the Evening Standard.

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