One in French, two in Italian and too much in English (5)
I believe the answer is:
undue
'italian and too much in english' is the definition.
I can't tell whether this definition defines the answer.
'one in french two' is the wordplay.
'one in french' becomes 'un' ('one' in French).
'two' becomes 'due' (I've seen this in another clue).
'un'+'due'='UNDUE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for undue that I've seen before include "More than appropriate" , "Beyond normal limits" , "Excessive - unwarranted" , "too much" , "Excessive, unreasonable" .)