Two articles and piece in end about new feared creature (8)
I believe the answer is:
anaconda
'feared creature' is the definition.
(dangerous snake)
'two articles and piece in end about new' is the wordplay.
'two articles' becomes 'ana' ('an' and 'a', English indefinite articles. I am not sure about the 'two' bit.).
'and' says to put letters next to each other.
'piece in end' becomes 'coda' (eg section at the end of a piece of music).
'about' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'coda' enclosing 'n' is 'conda'.
'ana'+'conda'='ANACONDA'
Can you help me to learn more?
(Other definitions for anaconda that I've seen before include "1 of 21 [SNAKES]" , "S. Am. constrictor snake" , "'No, Canada is home to the snake (8)'" , "Semi-aquatic boa" , "Huge South American snake" .)