Continental banker, right one outside hotel (5)
I believe the answer is:
rhone
'continental banker' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'right one outside hotel' is the wordplay.
'right' becomes 'r' (abbreviation).
'outside' means one lot of letters goes inside another.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'r'+'one'='rone'
'rone' enclosing 'h' is 'RHONE'.
Can you help me to learn more?
(Other definitions for rhone that I've seen before include "French wine region" , "Current" , "12 wine region" , "Swiss-French river" , "French flower" .)