You'll find one in a Caledonian discotheque (4)
I believe the answer is:
scot
'you'll' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?
'one in a caledonian discotheque' is the wordplay.
'one in' says the answer is hidden in the clue.
'SCOT' is hidden within 'caledonian discotheque'.
'find' acts as a link.
Can you help me to learn more?
(Other definitions for scot that I've seen before include "No longer tax" , "National" , "Payment" , "Burns for one" , "Native of country of the UK" .)