The upset about Charlie is very genuine (4)
I believe the answer is:
echt
'very genuine' is the definition.
'echt' can be an answer for 'genuine' (echt means genuine or authentic). I'm not certain of the 'very' bit.
'the upset about charlie' is the wordplay.
'upset' says the letters should be written backwards.
'about' is an insertion indicator.
'charlie' becomes 'C' (phonetic alphabet).
'the' reversed gives 'eht'.
'eht' going around 'c' is 'ECHT'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for echt that I've seen before include "Genuine (German)" , "Authentic and typical" , "True" , "German's real" , "Genuine -- honest" .)