I disapprove of times one wears short skirt (3-3)
I believe the answer is:
tut-tut
'short skirt' is the definition.
The definition suggests a singular noun which matches the answer.
'i disapprove of times one wears' is the wordplay.
I cannot really see how this works, but
'times' could be 'tt' (an abbreviation for time written twice) and 'tt' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tut-tut that I've seen before include "Disapproving sound" , "Word of disapproval" , "Expression of disapproval, contempt" , "Expression of irritation" , "Repetitive exclamation of annoyance or rebuke" .)