I'm past being a perfect creature! (5)

I believe the answer is:

imago

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'a perfect creature' is the definition.
'imago' can be an answer for 'creature' (imago is a kind of creature). I'm not certain of the 'a perfect' bit.

'i'm past' is the wordplay.
'past' becomes 'ago' (similar in meaning).
'im'+'ago'='IMAGO'

'being' is the link.

Can you help me to learn more?

(Other definitions for imago that I've seen before include "For example, monarch ultimately" , "Final stage of insect development" , "Eg monarch finally seen" , "spinner, say" , "Adult stage of an insect, typically winged" .)

I've seen this clue in the Evening Standard.

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