Percentage (5)

I think it could be either:

Which length description are you looking for?:

ratio

'percentage' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ratio that I've seen before include "Relation between two amounts" , "Comparative figure" , "One-to-one, maybe" , "Relation between two things, numbers say" , "Relative magnitude" .)

I've seen this clue in The Telegraph and the Penny Press.

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