Two that I can't parse......
21A: Old Prime Minister's gone back - to this? (5)
I have 'sleep', which is obviously from Peel's reversed (old PM's gone back)
but can't explain "- to this ?"
14A: Dost thou rate as most highly disagreeable ? (7) to which the answer is 'rankest'= most highly disagreeable (def) - but cannot fathom 'dost thou rate'
Explanations needed please !