Complete and utter lad dancing with a nude (13)
I believe the answer is:
unadulterated
'complete' is the definition.
'utter lad dancing with a nude' is the wordplay.
'dancing with' is an anagram indicator.
'utter'+'lad'='utterlad'
'a'+'nude'='anude'
'utterlad' anagrammed with 'anude' makes 'UNADULTERATED'.
'and' is the link.
(Other definitions for unadulterated that I've seen before include "Simple" , "not cut" , "Pure" , "Total" .)