Pan by Nutmeg

[ThePost]

Has anybody done this puzzle from the Crossword Club? I have completed it all except the very last item. What is 37ac and what is the saying? Any hints would be greatly appreciated. Thanks

[cruciverbali]

Think palindromes TP

[ThePost]

Only and best answer! Much appreciated cruciverbali. It makes sense although I would query whether a palindrome is a "saying".

Nevertheless - many thanks.