She joins a bachelor (possibly at Bath?) (5)
I believe the answer is:
sheba
'bath?' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?
'she joins a bachelor possibly' is the wordplay.
'joins' means one lot of letters go next to another.
'bachelor' becomes 'B' (abbreviation e.g. BA=Bachelor of Arts).
'possibly' indicates anagramming the letters.
'a'+'b'='ab'
'ab' with letters rearranged gives 'ba'.
'she'+'ba'='SHEBA'
'at' is the link.
Can you help me to learn more?
(Other definitions for sheba that I've seen before include "land of noted royal arrival" , "Biblical Queen of . . . . . visited King Solomon" , "Biblical queen's land" , "Old South Arabian kingdom" , "Ancient name of South Yemen" .)