Hard to get into club in foreign capital (4)
I believe the answer is:
baht
'foreign capital' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'hard to get into club' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'to get into' means one lot of letters goes inside another.
'club' becomes 'bat' (as in sporting equipment).
'h' going within 'bat' is 'BAHT'.
'in' is the link.
Can you help me to learn more?
(Other definitions for baht that I've seen before include "18 across currency" , "Monetary unit in Thailand" , "Currency of Thailand" , "Thai currency unit" , "Thai money" .)