Turning prude, I tut on seeing this (9)
I believe the answer is:
turpitude
'seeing this' is the definition.
The definition suggests a singular noun which matches the answer.
'turning prude i tut' is the wordplay.
'turning' is an anagram indicator.
'prude'+'i'+'tut'='prudeitut'
'prudeitut' anagrammed gives 'TURPITUDE'.
'on' is the link.
(Other definitions for turpitude that I've seen before include "corruption" , "Depravity, wickedness" , "Depraved or wicked behaviour" , "Baseness, depravity" .)