What the mimic is capable of or that's the feeling? (10)

I believe the answer is:

impression

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'the feeling?' is the definition.
('impression' can be a synonym of 'feeling')

I cannot understand how the rest of the clue works.

(Other definitions for impression that I've seen before include "Feeling; print" , "opinion" , "Imitation (of a person)" , "take-off" , "Mark" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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