Rancour in British and French island (4)
I believe the answer is:
bile
'rancour' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'british and french island' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'and' means one lot of letters go next to another.
'french island' becomes 'ile' ('island' in French).
'b'+'ile'='BILE'
'in' is the link.
Can you help me to learn more?
(Other definitions for bile that I've seen before include "Anger, bitterness" , "Spleen" , "Irritability, bad temper" , "Peevish temper; a liver secretion" , "Ill-temper" .)