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Charlie, a contract killer missing his last shots, exhausted (7)

Ross

I believe the answer is:

jackass

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'charlie' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for jackass that I've seen before include "Blockhead" , "One may lark about" , "Charlie" , "Male donkey - fool" , "Stupid person" .)

I've seen this clue in The Times.
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