Am older, bursting to succeed to this? (7)
I believe the answer is:
Here is my best explanation:
'succeed to this?' is the definition.
'am older bursting' is the wordplay.
'bursting' is an anagram indicator.
'amolder' is an anagram of 'EARLDOM'.
'to' is the link.
(Other definitions for earldom that I've seen before include "Noble's status", "What sort of noble has", "Noble's lands or rank", "Nobleman's estate", "Essex?", "Lands of a nobleman", "Aristocratic rank or title", "Peer's rank", "Aristocratic domain above a viscountcy but below a marquessate" and "Domain of a mid-ranking peer".)