Crossword Genius

A rent isn't modified in passing (9)

Ross

I believe the answer is:

transient

'passing' is the definition.
(I know that passing can be written as transient)

'a rent isn't modified' is the wordplay.
'modified' indicates anagramming the letters.
'a'+'rent'+'isnt'='arentisnt'
'arentisnt' with letters rearranged gives 'TRANSIENT'.

'in' acts as a link.

(Other definitions for transient that I've seen before include "Here today, gone tomorrow" , "Lasting a short time" , "Lasting little time" , "on the move" , "fugitive" .)

I've seen this clue in The Irish News.
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