Yes Charlie, that quotation is accurate (3)
I believe the answer is:
sic
'quotation is accurate' is the definition.
I can't judge whether this defines the answer.
'yes charlie' is the wordplay.
'yes' becomes 'si' (I can't justify this - if you can you should believe this answer much more).
'charlie' becomes 'C' (phonetic alphabet).
'si'+'c'='SIC'
'that' acts as a link.
Can you help me to learn more?
(Other definitions for sic that I've seen before include "Urge to attack" , "'Thus, in printing (3)'" , "As it stands, in printing" , "Thus in Corsica" , "Quoted exactly as in the original; so" .)