Really bad type in the CIA has a singing creature (6)
I believe the answer is:
cicada
'singing creature' is the definition.
'cicada' can be an answer for 'creature' (cicada is a kind of animal). I am not sure about the 'singing' bit.
'really bad type in the cia has a' is the wordplay.
'really bad type' becomes 'cd' (I can't justify this - if you can you should believe this answer much more).
'in the' indicates putting letters inside.
'has' is an insertion indicator.
'cd' put into 'cia' is 'cicda'.
'cicda' placed around 'a' is 'CICADA'.
Can you help me to learn more?
(Other definitions for cicada that I've seen before include "one that loves the heat" , "Noisy winged insect" , "Chirpy little thing" , "Bug sounding at night" , "Stridulating insect" .)