Crossword Genius

Hide unwritten poetry in the heart (7)

Ross

I believe the answer is:

blanket

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'hide' is the definition.
(thesaurus)

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

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(Other definitions for blanket that I've seen before include "Warm covering" , "warmer" , "Warm item of bedding" , "Cover with a thick layer" , "Comprehensive" .)

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