Stanford NLP - VP vs NP

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I have one example where Stanford NLP outputs a weird parse tree for the sentence:

Clean my desk

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(ROOT
  (NP
    (NP (JJ Clean))
    (NP (PRP$ my) (NN desk))))

As you can see, it tags the word Clean as an adjective dependent on the verb desk with the whole phrase being tagged as a Noun Phrase, while my expectation is for Clean to be tagged as a verb, and the phase as a Verb Phrase.

The JJ-PRP$-NN combination simply doesn't make sense in English to me. Anyone ever run into something similar? I know that Stanford NLP results sometimes differ based on the sequence (?) of parsing tools run. How to make this tag properly?

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