A little bit of heaven (7)

I believe the answer is:

seventh

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'heaven' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for seventh that I've seen before include "Interval just less than octave" , "This heaven is the most exalted state of happiness" , "In this heaven, one is ecstatic" , "after six" , "Position of Judges in Old Testament" .)

I've seen this clue in The Globe and Mail.

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