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Exaltation and short satisfied expression for one in bed (8)

Ross

I believe the answer is:

larkspur

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'bed' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for larkspur that I've seen before include "Delphinium-like plant" , "Flower like a delphinium" , "Mediterranean plant with spikes of blue, pink or white flowers" , "Blue flower" , "it grows" .)

I've seen this clue in The Guardian.
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