Setter's mature and creates an impression (5)

I believe the answer is:

image

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'impression' is the definition.
(I know that image is a type of impression)

'setter's mature' is the wordplay.
'setter's' becomes 'I'm' (referring to the crossword setter).
'mature' becomes 'age' (synonyms).
'im'+'age'='IMAGE'

'and creates an' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for image that I've seen before include "Figure (of speech?)" , "Optical counterpart in mirror" , "Mental picture; idol" , "Visible impression" , "of Kairos with Melchior?" .)

I've seen this clue in The Irish Times.

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