Crossword Genius

Clip edge of picture so there's nothing but the adult insect shown? (5)

Ross

I believe the answer is:

imago

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'clip' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for imago that I've seen before include "Beetle, for example" , "being immature?" , "Picture of saint" , "Adult, post-metamorphosis insect" , "A mental picture" .)

I've seen this clue in The Irish Times.
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