Delete from Will's Tinder his raving about me subjectively (10)
I believe the answer is:
disinherit
'delete from will's' is the definition.
'tinder his raving about me subjectively' is the wordplay.
'raving' indicates anagramming the letters.
'about' is an insertion indicator.
'me subjectively' becomes 'i' ('I' is the subject pronoun corresponding to 'me').
'tinder'+'his'='tinderhis'
'tinderhis' is an anagram of 'disnherit'.
'disnherit' placed around 'i' is 'DISINHERIT'.
(Other definitions for disinherit that I've seen before include "Lanarkshire town" , "Cut off as with a shilling" , "Write out of a will" , "Remove as heir" .)