Crossword Genius

One avoids late night parties finally (2,6)

Ross

I believe the answer is:

at length

'finally' is the definition.
(synonyms)

'one avoids late night parties' is the wordplay.
'one' becomes 'i' (roman numeral).
'avoids' is a deletion indicator.
'parties' indicates anagramming the letters (the letters move or party around).
'late'+'night'='latenight'
'latenight' with 'i' taken away is 'latenght'.
'latenght' with letters rearranged gives 'AT LENGTH'.

(Other definitions for at length that I've seen before include "In exhaustive detail, after a long time" , "In detail, taking a long time" , "In full detail" , "Finally" , "In detail, fully" .)

I've seen this clue in The Hindu.
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