Distance round middle's roughly right (5)
I believe the answer is:
girth
'distance round' is the definition.
(I've seen this before)
'middle's roughly right' is the wordplay.
'right' can be anagrammed to 'GIRTH'.
However, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for girth that I've seen before include "Right (anag.)" , "Perimeter" , "all the way round" , "Distance around, often of the tummy" , "A band passing under horse's belly" .)