Crossword Genius

Wonderful feeling of insouciance reduced by then dropping ecstasy (5)

Ross

I believe the answer is:

bliss

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

I cannot understand how the rest of the clue works.

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(Other definitions for bliss that I've seen before include "of composing?" , "promise of afterlife" , "One who scored" , "Seventh 13 across" , "Sheer delight" .)

I've seen this clue in The Independent.
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