Right sort of measure (5)
I believe the answer is:
girth
'measure' is the definition.
(I've seen this before)
'right sort' is the wordplay.
'sort' indicates an anagram.
'right' is an anagram of 'GIRTH'.
'of' acts as a link.
(Other definitions for girth that I've seen before include "Right (anag.)" , "The distance around a thing or tummy" , "Circumferential measure" , "Perimeter" , "Target of diet" .)