Crossword Genius

To arrange unit on left (5)

Ross

I believe the answer is:

until

'to' is the definition.
(thesaurus)

'arrange unit on left' is the wordplay.
'arrange' is an anagram indicator.
'on' is a charade indicator (letters next to each other).
'left' becomes 'L' (common abbreviation).
'unit' anagrammed gives 'unti'.
'unti'+'l'='UNTIL'

(Other definitions for until that I've seen before include "Before a given time" , "As late as" , "As far as" , "Unlit (anag.)" , "Up to that moment" .)

I've seen this clue in The Globe and Mail.
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