The French bilge is possibly quite readable (7)
I believe the answer is:
legible
'quite readable' is the definition.
'legible' can be an answer for 'readable' ('legible' can be similar in meaning to 'readable'). I am not certain of the 'quite' bit.
'the french bilge is possibly' is the wordplay.
'the french' becomes 'le'.
'is possibly' indicates an anagram.
'bilge' is an anagram of 'gible'.
'le'+'gible'='LEGIBLE'
Can you help me to learn more?
(Other definitions for legible that I've seen before include "Well written" , "Clear enough to read" , "Easy to read" , "Decipherable" , "Good characters are" .)