Crossword Genius

Legal term for a sum paid by a new tenant for remaining fixtures (7)

Ross

I believe the answer is:

ingoing

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'legal' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for ingoing that I've seen before include "Entering" , "Making entry" , "Heading inwards" , "Just elected" , "Approaching" .)

I've seen this clue in The Times.
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