Crossword Genius

Aide's unusual impression (4)

Ross

I believe the answer is:

idea

I'm a little stuck... Click here to teach me more about this clue!

'impression' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for idea that I've seen before include "Inkling" , "intellectual product" , "Suggestion" , "Content of cognition" , "Notion in the mind" .)

I've seen this clue in The Mirror.
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