Blessed at last with love and married (7)
I believe the answer is:
'blessed' is the definition.
(similar in meaning)
'last with love and married' is the wordplay.
'last' becomes 'end'.
'with' is a charade indicator (letters next to each other).
'love' becomes 'o' (love means zero in tennis).
'and' is a charade indicator (letters next to each other).
'married' becomes 'wed' (similar in meaning).
'at' is the link.
(Other definitions for endowed that I've seen before include "Given a permanent income", "given a portion?", "Left", "funded", "Invested".)