She is swanning about again - she's rich (7)
I believe the answer is:
heiress
'again she's rich' is the definition.
I can't tell whether this defines the answer.
'she is swanning about' is the wordplay.
I cannot really see how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found within the answer.
'is' is present in the answer.
an anagram of 'she' is 'hes' which is within the left over letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for heiress that I've seen before include "One coming into wealth" , "Woman with good prospects" , "Woman destined to succeed!" , "One due to inherit" , "she's going to succeed" .)