Crossword Genius

For which finally souls get ferry and cross? (4)

Ross

I believe the answer is:

styx

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'for' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I can't see?

'finally souls get ferry and cross?' is the wordplay.
'finally' says to take the final letters.
'and' is a charade indicator (letters next to each other).
'cross?' becomes 'x' (X is cross-shaped).
The last letters of 'souls get ferry' are 'sty'.
'sty'+'x'='STYX'

'which' is the link.

Can you help me to learn more?

(Other definitions for styx that I've seen before include "Mythological river in Hades" , "One of the underworld rivers" , "classical stream" , "One of the rivers of Hades" , "Underworld river; sounds like remote area" .)

I've seen this clue in The Times.
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