Rose could be so troublesome! (6)

I believe the answer is:

thorny

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

I don't understand the rest of the clue.

(Other definitions for thorny that I've seen before include "Spiky (of bush or problem)" , "Difficult like briar" , "Bristling with perplexities" , "Troublesome or difficult, like briars?" , "Causing difficulty - like a bed of roses?" .)

I've seen this clue in the Sydney Morning Herald.

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