Crossword Genius

Western term for an Eastern rising (5)

Ross

I believe the answer is:

sunup

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'western term' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Maybe there's an association between them I don't understand?

'for an eastern rising' is the wordplay.
'for an' becomes 'nus' (I can't justify this - if you can you should believe this answer much more).
'eastern' says the letters should be written in reverse (letters written right to left or east to west).
'rising' becomes 'up' (similar in meaning).
'nus' back-to-front is 'sun'.
'sun'+'up'='SUNUP'

Can you help me to learn more?

(Other definitions for sunup that I've seen before include "Daybreak (in America)" , "Solar appearance (US)" , "time of day" , "Literal version of dawn" , "Dawn (American)" .)

I've seen this clue in the Evening Standard.
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