Good morning, Elle!
Your weather is identical to mine!
Had to scrape the windscreen earlier.
Hopefully the weekend's weather will be the same!
Now, this clue, which I no longer have!
St Mary, pants, is smarty.
Chambers definition of "pants" is "nonsense", which is a good indicator of an anagram.
In this clue the answer gives the indicator, I think.
If you get "smarty", the only word that I can think of, that goes with it, is "pants".
I thought it a fairly easy clue, but can understand you being less than content with it.
I think that is the best I can do, as I no longer have the clue to disassemble.
You arrived at the correct answer, which suggests the clue works, and is fair?