Flower of darkness adheres to the ear (4)

I believe the answer is:

styx

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'flower of darkness' is the definition.
'styx' can be an answer for 'flower' (mythical river). I am not sure about the 'of darkness' bit.

'adheres to the ear' is the wordplay.
'adheres' becomes 'sticks' ('stick' can be a synonym of 'adhere').
'to the ear' indicates a 'sounds like' (homophone) clue.
'sticks' sounds like 'STYX'.

Can you help me to learn more?

(Other definitions for styx that I've seen before include "River around Hades" , "Charon's 26 carried dead souls across this river" , "Hellish current" , "Hell's river" , "River crossed at death" .)

I've seen this clue in The Telegraph.

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