Crossword Genius

Excursion — choose to cut both ends off (6)

Ross

I believe the answer is:

picnic

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'excursion' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for picnic that I've seen before include "something easy to do" , "outdoor eating" , "Alfresco repast" , "Informal outdoor summer meal" , "is difficult" .)

I've seen this clue in The Guardian.
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