Obscured top of dicky heart? (5)

I believe the answer is:

midst

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'heart?' is the definition.
(thesaurus)

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

(Other definitions for midst that I've seen before include "Centre" , "In the middle of (archaic or literary)" , "Where one is surrounded by other things" , "Among, amid" , "Central part" .)

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

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