Can you get shot for writing one? (5)

I believe the answer is:

essay

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'writing one?' is the definition.
'essay' can be an answer for 'writing' (thesaurus). I am not sure about the 'one?' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for essay that I've seen before include "Try - composition" , "Written composition" , "Short treatise" , "Test" , "Make an effort or attempt" .)

I've seen this clue in the Evening Standard.

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