The Barony of Dinevor was created on 17 Oct 1780 for William Talbot, 1st Earl Talbot of Hensol for life with remainder to his only daughter (and only surviving child), Lady Cecil, and her heirs male (J. C. Sainty, Peerage Creations (2008), p 50).
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J. C. Sainty always notes down the exact wording used in the special remainder to a peerage.
In the case of the special remainder “for life” etc with an added clause, there are several other examples such as the Barony of Dinevor. If anyone is interested, here are the particulars for the peerage: C 231/12, 278; LP 20 Geo III enrolled 21 (sic) Geo III, pt 1 (C 66/3782) no 18. Here is what I noted down from Sainty's work in my chronological peerage list:
Dukedom of Southampton (1670). For life with remainder to her eldest son Charles Palmer and his heirs male, failing which to her second son, George Palmer, and his heirs male. Note that despite what the LP states, both were actually children borne by Charles I and in effect the remainder is to them as illegitimate children.
Dukedom of Schomberg (1689). For life with remainder to his third son, Charles Schomberg, and his heirs male, failing which to his second son, Meinhardt Schomberg, and his heirs male respectively, failing which to his own heirs male.
Dukedom of Bedford (1694). For life with remainder to his grandson, Wriothesley Russell, and his heirs male.
Barony of Howland (1695). For life with remainder to his grandson, Wriothesley Russell, styled Marquess of Tavistock, and his heirs male, by his wife, Elizabeth Howland.
Viscountcy of St John (1716). For life with remainder to his second son, John St John, later 1st Viscount Bolingbroke, and his heirs male, failing which to the heirs of the grantee hereafter to be begotten.
Barony of Lovaine (1784). For life with remainder to his second son, Lord Algernon Percy, and his heirs male.
Barony of Sandys (1802). Arthur Moyses William Hill; (2) her third son, Lord Arthur Marcus Cecil Hill; (3) her fourth son, Lord Arthur Augustus Edwin Hill; (4) her fifth son, Lord George Augusta (sic) Hill, in default of which, (5) to her eldest son, Arthur Blundell Sandys Trumbull Hill, 3rd Marquess of Downshire [I], and their heirs male respectively.
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