Sell satiric Ravel audio? (5,5)
I believe the answer is:
'sell satiric ravel audio?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'ravel audio?' is the wordplay.
I cannot quite understand how this works, but
'ravel' could be 'tangle' (synonyms) and 'tangle' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for right angle that I've seen before include "That between perpendicular and base" , "Square's corner" , "Ninety-degree corner" , "Ninety degrees" , "Ninety degree corner" .)