Intervals (4)

I think it could be either:

Which length description are you looking for?:

gaps

'intervals' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for gaps that I've seen before include "Breaks or openings as in hedge or fence" , "Breaks, spaces" .)

I've seen this clue in The Washington Post.

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