Second thoughts about former dishes (6)
I believe the answer is:
plates
'dishes' is the definition.
(plate is a kind of dish)
'second thoughts about former' is the wordplay.
'second thoughts' becomes 'ps' (as in a PS in a letter).
'about' means one lot of letters goes inside another.
'former' becomes 'late' (late can mean former or previous).
'ps' enclosing 'late' is 'PLATES'.
(Other definitions for plates that I've seen before include "Flat dishes" , "dentures" , "Shallow dishes" , "Strange staple for crockery items" , "Eating utensils of staple kind" .)