Disclose what one has to do to a dress that's too tight (3,3)
I believe the answer is:
Here is my best explanation:
'disclose' is the definition.
'what one has to do to a dress that's too tight' is the wordplay.
I cannot quite see how this works, but
'to' is present in the answer.
'do' could be 'ut' (synonyms) and 'ut' is located in the answer.
This may be the basis of clue (or it may be nonsense).