I will say - bile turned out to be indecipherable (9)
I believe the answer is:
illegible
'to be indecipherable' is the definition.
('illegible' can be similar in meaning to 'indecipherable')
'i will say bile turned' is the wordplay.
'i will' becomes 'I'll' (abbreviation).
'say' becomes 'eg' (both can mean 'for example').
'turned' is an anagram indicator.
'bile' is an anagram of 'ible'.
'ill'+'eg'+'ible'='ILLEGIBLE'
'out' is the link.
(Other definitions for illegible that I've seen before include "Not capable of being read" , "Hard to read" , "Unreadable" , "Too messy to read" , "Not easily read" .)