It's up for debate (6)

I think it could be either:

Which length description are you looking for?:

topic

'it's up for debate' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for topic that I've seen before include "Question" , "Content of argument" , "Subject (of a talk, etc)" , "Issue (for discussion)" , "Talking point" .)

I've seen this clue in The New York Times and The Wall Street Journal.

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