She has yet to meet her match (8)
I believe the answer is:
spinster
'match' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for spinster that I've seen before include "Unmarried older woman" , "Single woman" , "old maid, perhaps" , "For example, Miss Havisham" , "woman like Miss Havisham" .)