Bachelor girl in the old country (5)
I believe the answer is:
sheba
'old country' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?
'bachelor girl in' is the wordplay.
'bachelor' becomes 'B' (abbreviation e.g. BA=Bachelor of Arts).
'girl' becomes 'shea' ().
'in' means one lot of letters goes inside another.
'b' going inside 'shea' is 'SHEBA'.
'the' is the link.
Can you help me to learn more?
(Other definitions for sheba that I've seen before include "Its queen is said to have visited Solomon" , "Biblical queen's realm" , "Ancient name of South Yemen" , "Hence Queen" , "Old South Arabian kingdom" .)