Speech laid bare relationship between two figures (5)
I believe the answer is:
ratio
'speech' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ratio that I've seen before include "Relation between two amounts" , "Relative proportion" , "five to four, perhaps" , "Mathematical relation of one thing to another" , "2:1, for example" .)