A ringlet made complete (8)
I believe the answer is:
integral
'complete' is the definition.
(I've seen this in another clue)
'a ringlet made' is the wordplay.
'made' is an anagram indicator.
'a'+'ringlet'='aringlet'
'aringlet' is an anagram of 'INTEGRAL'.
(Other definitions for integral that I've seen before include "Belonging as an essential part" , "contributing to unity" , "Large tin (anag.)" , "Altering (anag)" , "Fundamental; function" .)