The end of the said potty is missing (5)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

An anagram (‘potty’) of ‘the [s]a[i]d’ minus IS (‘is missing’), with the usual argument about whether or not a separate anagrind is needed for ‘is’; evidently, Brummie comes down here on the “not” side.