Dai may be in a tavern with one (6)
I believe the answer is:
indian
'one' is the definition.
Although both the answer and definition are adjectives, I cannot see how they can define each other.
'dai may be in a tavern' is the wordplay.
'may be' is an anagram indicator.
'in' means one lot of letters goes inside another.
'a tavern' becomes 'inn' (I've seen this before).
'dai' anagrammed gives 'dia'.
'dia' put into 'inn' is 'INDIAN'.
'with' is the link.
Can you help me to learn more?
(Other definitions for indian that I've seen before include "Relating to Asian subcontinent" , "Relating to native of Bombay, say" , "Nationality of Salman Rushdie" , "IDA inn provides for this nationality" , "IDA inn provided for this nationality" .)